High CPU usage in gnome-shell just redrawing the screen (Firefox is running)

[Rasmus Eneman]

Even when doing nothing at all, gnome-shell uses around 70% CPU.

```
inxi -t cm
Processes: CPU: % used - top 5 active
           1: cpu: 68.6% command: gnome-shell pid: 1399
           2: cpu: 50.4% command: Xwayland pid: 1405
           3: cpu: 19.7% command: firefox pid: 3684
           4: cpu: 2.4% command: gnome-shell pid: 1859
           5: cpu: 1.5% command: gnome-tweak-tool (started by: python) pid: 13603
           Memory: MB / % used - Used/Total: 2350.1/11897.0MB - top 5 active
           1: mem: 1033.63MB (8.6%) command: firefox pid: 3684
           2: mem: 317.59MB (2.6%) command: gnome-shell pid: 1859
           3: mem: 267.55MB (2.2%) command: gnome-software pid: 2058
           4: mem: 111.25MB (0.9%) command: Xorg pid: 1506
           5: mem: 90.90MB (0.7%) command: nautilus-desktop pid: 2055
```

It's also strange that Xwayland is active as I did choose the "normal" gnome session upon signin.
```
echo $XDG_SESSION_TYPE
x11
```

While searching I found a recent problem with AMD GPUs, but I'm using an Intel GPU
```
glxinfo
name of display: :0
display: :0 screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile,
    GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float,
    GLX_ARB_framebuffer_sRGB, GLX_ARB_multisample,
    GLX_EXT_create_context_es2_profile, GLX_EXT_create_context_es_profile,
    GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB,
    GLX_EXT_import_context, GLX_EXT_libglvnd, GLX_EXT_texture_from_pixmap,
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_INTEL_swap_event,
    GLX_MESA_copy_sub_buffer, GLX_OML_swap_method, GLX_SGIS_multisample,
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group,
    GLX_SGI_make_current_read, GLX_SGI_swap_control
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile,
    GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float,
    GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample,
    GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile,
    GLX_EXT_create_context_es_profile, GLX_EXT_fbconfig_packed_float,
    GLX_EXT_framebuffer_sRGB, GLX_EXT_import_context,
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating,
    GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer,
    GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,
    GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control,
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
    GLX_SGIX_visual_select_group, GLX_SGI_make_current_read,
    GLX_SGI_swap_control, GLX_SGI_video_sync
GLX version: 1.4
GLX extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile,
    GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float,
    GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample,
    GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile,
    GLX_EXT_create_context_es_profile, GLX_EXT_fbconfig_packed_float,
    GLX_EXT_framebuffer_sRGB, GLX_EXT_import_context,
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating,
    GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer,
    GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,
    GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control,
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
    GLX_SGIX_visual_select_group, GLX_SGI_make_current_read,
    GLX_SGI_swap_control, GLX_SGI_video_sync
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Intel Open Source Technology Center (0x8086)
    Device: Mesa DRI Intel(R) Haswell Mobile (0xa16)
    Version: 17.1.0
    Accelerated: yes
    Video memory: 1536MB
    Unified memory: yes
    Preferred profile: core (0x1)
    Max core profile version: 4.5
    Max compat profile version: 3.0
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.1
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile
OpenGL core profile version string: 4.5 (Core Profile) Mesa 17.1.0
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
    GL_3DFX_texture_compression_FXT1, GL_AMD_conservative_depth,
    GL_AMD_draw_buffers_blend, GL_AMD_seamless_cubemap_per_texture,
    GL_AMD_shader_trinary_minmax, GL_AMD_vertex_shader_layer,
    GL_AMD_vertex_shader_viewport_index, GL_ANGLE_texture_compression_dxt3,
    GL_ANGLE_texture_compression_dxt5, GL_APPLE_object_purgeable,
    GL_ARB_ES2_compatibility, GL_ARB_ES3_1_compatibility,
    GL_ARB_ES3_compatibility, GL_ARB_arrays_of_arrays, GL_ARB_base_instance,
    GL_ARB_blend_func_extended, GL_ARB_buffer_storage,
    GL_ARB_clear_buffer_object, GL_ARB_clear_texture, GL_ARB_clip_control,
    GL_ARB_compressed_texture_pixel_storage, GL_ARB_compute_shader,
    GL_ARB_conditional_render_inverted, GL_ARB_conservative_depth,
    GL_ARB_copy_buffer, GL_ARB_copy_image, GL_ARB_cull_distance,
    GL_ARB_debug_output, GL_ARB_depth_buffer_float, GL_ARB_depth_clamp,
    GL_ARB_derivative_control, GL_ARB_direct_state_access,
    GL_ARB_draw_buffers, GL_ARB_draw_buffers_blend,
    GL_ARB_draw_elements_base_vertex, GL_ARB_draw_indirect,
    GL_ARB_draw_instanced, GL_ARB_enhanced_layouts,
    GL_ARB_explicit_attrib_location, GL_ARB_explicit_uniform_location,
    GL_ARB_fragment_coord_conventions, GL_ARB_fragment_layer_viewport,
    GL_ARB_fragment_shader, GL_ARB_framebuffer_no_attachments,
    GL_ARB_framebuffer_object, GL_ARB_framebuffer_sRGB,
    GL_ARB_get_program_binary, GL_ARB_get_texture_sub_image,
    GL_ARB_gpu_shader5, GL_ARB_gpu_shader_fp64, GL_ARB_half_float_pixel,
    GL_ARB_half_float_vertex, GL_ARB_instanced_arrays,
    GL_ARB_internalformat_query, GL_ARB_internalformat_query2,
    GL_ARB_invalidate_subdata, GL_ARB_map_buffer_alignment,
    GL_ARB_map_buffer_range, GL_ARB_multi_bind, GL_ARB_multi_draw_indirect,
    GL_ARB_occlusion_query2, GL_ARB_pipeline_statistics_query,
    GL_ARB_pixel_buffer_object, GL_ARB_point_sprite,
    GL_ARB_program_interface_query, GL_ARB_provoking_vertex,
    GL_ARB_query_buffer_object, GL_ARB_robust_buffer_access_behavior,
    GL_ARB_robustness, GL_ARB_sample_shading, GL_ARB_sampler_objects,
    GL_ARB_seamless_cube_map, GL_ARB_seamless_cubemap_per_texture,
    GL_ARB_separate_shader_objects, GL_ARB_shader_atomic_counter_ops,
    GL_ARB_shader_atomic_counters, GL_ARB_shader_bit_encoding,
    GL_ARB_shader_clock, GL_ARB_shader_draw_parameters,
    GL_ARB_shader_image_load_store, GL_ARB_shader_image_size,
    GL_ARB_shader_objects, GL_ARB_shader_precision,
    GL_ARB_shader_storage_buffer_object, GL_ARB_shader_subroutine,
    GL_ARB_shader_texture_image_samples, GL_ARB_shader_texture_lod,
    GL_ARB_shader_viewport_layer_array, GL_ARB_shading_language_420pack,
    GL_ARB_shading_language_packing, GL_ARB_stencil_texturing, GL_ARB_sync,
    GL_ARB_tessellation_shader, GL_ARB_texture_barrier,
    GL_ARB_texture_buffer_object, GL_ARB_texture_buffer_object_rgb32,
    GL_ARB_texture_buffer_range, GL_ARB_texture_compression_bptc,
    GL_ARB_texture_compression_rgtc, GL_ARB_texture_cube_map_array,
    GL_ARB_texture_float, GL_ARB_texture_gather,
    GL_ARB_texture_mirror_clamp_to_edge, GL_ARB_texture_multisample,
    GL_ARB_texture_non_power_of_two, GL_ARB_texture_query_levels,
    GL_ARB_texture_query_lod, GL_ARB_texture_rectangle, GL_ARB_texture_rg,
    GL_ARB_texture_rgb10_a2ui, GL_ARB_texture_stencil8,
    GL_ARB_texture_storage, GL_ARB_texture_storage_multisample,
    GL_ARB_texture_swizzle, GL_ARB_texture_view, GL_ARB_timer_query,
    GL_ARB_transform_feedback2, GL_ARB_transform_feedback3,
    GL_ARB_transform_feedback_instanced,
    GL_ARB_transform_feedback_overflow_query, GL_ARB_uniform_buffer_object,
    GL_ARB_vertex_array_bgra, GL_ARB_vertex_array_object,
    GL_ARB_vertex_attrib_64bit, GL_ARB_vertex_attrib_binding,
    GL_ARB_vertex_shader, GL_ARB_vertex_type_10f_11f_11f_rev,
    GL_ARB_vertex_type_2_10_10_10_rev, GL_ARB_viewport_array,
    GL_ATI_blend_equation_separate, GL_ATI_texture_float, GL_EXT_abgr,
    GL_EXT_blend_equation_separate, GL_EXT_draw_buffers2,
    GL_EXT_draw_instanced, GL_EXT_framebuffer_blit,
    GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_multisample_blit_scaled,
    GL_EXT_framebuffer_sRGB, GL_EXT_packed_depth_stencil, GL_EXT_packed_float,
    GL_EXT_pixel_buffer_object, GL_EXT_polygon_offset_clamp,
    GL_EXT_provoking_vertex, GL_EXT_shader_integer_mix,
    GL_EXT_shader_samples_identical, GL_EXT_texture_array,
    GL_EXT_texture_compression_dxt1, GL_EXT_texture_compression_rgtc,
    GL_EXT_texture_compression_s3tc, GL_EXT_texture_filter_anisotropic,
    GL_EXT_texture_integer, GL_EXT_texture_sRGB, GL_EXT_texture_sRGB_decode,
    GL_EXT_texture_shared_exponent, GL_EXT_texture_snorm,
    GL_EXT_texture_swizzle, GL_EXT_timer_query, GL_EXT_transform_feedback,
    GL_EXT_vertex_array_bgra, GL_IBM_multimode_draw_arrays,
    GL_INTEL_performance_query, GL_KHR_blend_equation_advanced,
    GL_KHR_context_flush_control, GL_KHR_debug,
    GL_KHR_robust_buffer_access_behavior, GL_KHR_robustness,
    GL_MESA_pack_invert, GL_MESA_shader_integer_functions,
    GL_MESA_texture_signed_rgba, GL_NV_conditional_render, GL_NV_depth_clamp,
    GL_NV_packed_depth_stencil, GL_NV_texture_barrier, GL_OES_EGL_image,
    GL_S3_s3tc

OpenGL version string: 3.0 Mesa 17.1.0
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
    GL_3DFX_texture_compression_FXT1, GL_AMD_conservative_depth,
    GL_AMD_draw_buffers_blend, GL_AMD_seamless_cubemap_per_texture,
    GL_AMD_shader_trinary_minmax, GL_ANGLE_texture_compression_dxt3,
    GL_ANGLE_texture_compression_dxt5, GL_APPLE_object_purgeable,
    GL_APPLE_packed_pixels, GL_APPLE_vertex_array_object,
    GL_ARB_ES2_compatibility, GL_ARB_ES3_compatibility,
    GL_ARB_arrays_of_arrays, GL_ARB_blend_func_extended,
    GL_ARB_buffer_storage, GL_ARB_clear_buffer_object, GL_ARB_clear_texture,
    GL_ARB_clip_control, GL_ARB_color_buffer_float,
    GL_ARB_compressed_texture_pixel_storage, GL_ARB_compute_shader,
    GL_ARB_conditional_render_inverted, GL_ARB_conservative_depth,
    GL_ARB_copy_buffer, GL_ARB_copy_image, GL_ARB_cull_distance,
    GL_ARB_debug_output, GL_ARB_depth_buffer_float, GL_ARB_depth_clamp,
    GL_ARB_depth_texture, GL_ARB_derivative_control, GL_ARB_draw_buffers,
    GL_ARB_draw_buffers_blend, GL_ARB_draw_elements_base_vertex,
    GL_ARB_draw_instanced, GL_ARB_explicit_attrib_location,
    GL_ARB_explicit_uniform_location, GL_ARB_fragment_coord_conventions,
    GL_ARB_fragment_program, GL_ARB_fragment_program_shadow,
    GL_ARB_fragment_shader, GL_ARB_framebuffer_no_attachments,
    GL_ARB_framebuffer_object, GL_ARB_framebuffer_sRGB,
    GL_ARB_get_program_binary, GL_ARB_get_texture_sub_image,
    GL_ARB_half_float_pixel, GL_ARB_half_float_vertex,
    GL_ARB_instanced_arrays, GL_ARB_internalformat_query,
    GL_ARB_internalformat_query2, GL_ARB_invalidate_subdata,
    GL_ARB_map_buffer_alignment, GL_ARB_map_buffer_range, GL_ARB_multi_bind,
    GL_ARB_multisample, GL_ARB_multitexture, GL_ARB_occlusion_query,
    GL_ARB_occlusion_query2, GL_ARB_pipeline_statistics_query,
    GL_ARB_pixel_buffer_object, GL_ARB_point_parameters, GL_ARB_point_sprite,
    GL_ARB_program_interface_query, GL_ARB_provoking_vertex,
    GL_ARB_query_buffer_object, GL_ARB_robust_buffer_access_behavior,
    GL_ARB_robustness, GL_ARB_sample_shading, GL_ARB_sampler_objects,
    GL_ARB_seamless_cube_map, GL_ARB_seamless_cubemap_per_texture,
    GL_ARB_separate_shader_objects, GL_ARB_shader_atomic_counter_ops,
    GL_ARB_shader_atomic_counters, GL_ARB_shader_bit_encoding,
    GL_ARB_shader_clock, GL_ARB_shader_draw_parameters,
    GL_ARB_shader_image_load_store, GL_ARB_shader_image_size,
    GL_ARB_shader_objects, GL_ARB_shader_precision,
    GL_ARB_shader_storage_buffer_object, GL_ARB_shader_texture_image_samples,
    GL_ARB_shader_texture_lod, GL_ARB_shading_language_100,
    GL_ARB_shading_language_420pack, GL_ARB_shading_language_packing,
    GL_ARB_shadow, GL_ARB_stencil_texturing, GL_ARB_sync,
    GL_ARB_texture_barrier, GL_ARB_texture_border_clamp,
    GL_ARB_texture_compression, GL_ARB_texture_compression_bptc,
    GL_ARB_texture_compression_rgtc, GL_ARB_texture_cube_map,
    GL_ARB_texture_cube_map_array, GL_ARB_texture_env_add,
    GL_ARB_texture_env_combine, GL_ARB_texture_env_crossbar,
    GL_ARB_texture_env_dot3, GL_ARB_texture_float, GL_ARB_texture_gather,
    GL_ARB_texture_mirror_clamp_to_edge, GL_ARB_texture_mirrored_repeat,
    GL_ARB_texture_multisample, GL_ARB_texture_non_power_of_two,
    GL_ARB_texture_query_levels, GL_ARB_texture_query_lod,
    GL_ARB_texture_rectangle, GL_ARB_texture_rg, GL_ARB_texture_rgb10_a2ui,
    GL_ARB_texture_stencil8, GL_ARB_texture_storage,
    GL_ARB_texture_storage_multisample, GL_ARB_texture_swizzle,
    GL_ARB_texture_view, GL_ARB_timer_query, GL_ARB_transform_feedback2,
    GL_ARB_transform_feedback3, GL_ARB_transform_feedback_instanced,
    GL_ARB_transform_feedback_overflow_query, GL_ARB_transpose_matrix,
    GL_ARB_uniform_buffer_object, GL_ARB_vertex_array_bgra,
    GL_ARB_vertex_array_object, GL_ARB_vertex_attrib_binding,
    GL_ARB_vertex_buffer_object, GL_ARB_vertex_program, GL_ARB_vertex_shader,
    GL_ARB_vertex_type_10f_11f_11f_rev, GL_ARB_vertex_type_2_10_10_10_rev,
    GL_ARB_window_pos, GL_ATI_blend_equation_separate, GL_ATI_draw_buffers,
    GL_ATI_separate_stencil, GL_ATI_texture_env_combine3,
    GL_ATI_texture_float, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color,
    GL_EXT_blend_equation_separate, GL_EXT_blend_func_separate,
    GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_compiled_vertex_array,
    GL_EXT_copy_texture, GL_EXT_draw_buffers2, GL_EXT_draw_instanced,
    GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_blit,
    GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_multisample_blit_scaled,
    GL_EXT_framebuffer_object, GL_EXT_framebuffer_sRGB,
    GL_EXT_gpu_program_parameters, GL_EXT_multi_draw_arrays,
    GL_EXT_packed_depth_stencil, GL_EXT_packed_float, GL_EXT_packed_pixels,
    GL_EXT_pixel_buffer_object, GL_EXT_point_parameters,
    GL_EXT_polygon_offset, GL_EXT_polygon_offset_clamp,
    GL_EXT_provoking_vertex, GL_EXT_rescale_normal, GL_EXT_secondary_color,
    GL_EXT_separate_specular_color, GL_EXT_shader_integer_mix,
    GL_EXT_shader_samples_identical, GL_EXT_shadow_funcs,
    GL_EXT_stencil_two_side, GL_EXT_stencil_wrap, GL_EXT_subtexture,
    GL_EXT_texture, GL_EXT_texture3D, GL_EXT_texture_array,
    GL_EXT_texture_compression_dxt1, GL_EXT_texture_compression_rgtc,
    GL_EXT_texture_compression_s3tc, GL_EXT_texture_cube_map,
    GL_EXT_texture_edge_clamp, GL_EXT_texture_env_add,
    GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3,
    GL_EXT_texture_filter_anisotropic, GL_EXT_texture_integer,
    GL_EXT_texture_lod_bias, GL_EXT_texture_object, GL_EXT_texture_rectangle,
    GL_EXT_texture_sRGB, GL_EXT_texture_sRGB_decode,
    GL_EXT_texture_shared_exponent, GL_EXT_texture_snorm,
    GL_EXT_texture_swizzle, GL_EXT_timer_query, GL_EXT_transform_feedback,
    GL_EXT_vertex_array, GL_EXT_vertex_array_bgra,
    GL_IBM_multimode_draw_arrays, GL_IBM_rasterpos_clip,
    GL_IBM_texture_mirrored_repeat, GL_INGR_blend_func_separate,
    GL_INTEL_performance_query, GL_KHR_blend_equation_advanced,
    GL_KHR_context_flush_control, GL_KHR_debug,
    GL_KHR_robust_buffer_access_behavior, GL_KHR_robustness,
    GL_MESA_pack_invert, GL_MESA_shader_integer_functions,
    GL_MESA_texture_signed_rgba, GL_MESA_window_pos, GL_NV_blend_square,
    GL_NV_conditional_render, GL_NV_depth_clamp, GL_NV_light_max_exponent,
    GL_NV_packed_depth_stencil, GL_NV_primitive_restart,
    GL_NV_texgen_reflection, GL_NV_texture_barrier,
    GL_NV_texture_env_combine4, GL_NV_texture_rectangle, GL_OES_EGL_image,
    GL_OES_read_format, GL_S3_s3tc, GL_SGIS_generate_mipmap,
    GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp,
    GL_SGIS_texture_lod, GL_SUN_multi_draw_arrays

OpenGL ES profile version string: OpenGL ES 3.1 Mesa 17.1.0
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10
OpenGL ES profile extensions:
    GL_ANGLE_texture_compression_dxt3, GL_ANGLE_texture_compression_dxt5,
    GL_APPLE_texture_max_level, GL_EXT_blend_func_extended,
    GL_EXT_blend_minmax, GL_EXT_buffer_storage, GL_EXT_clip_cull_distance,
    GL_EXT_color_buffer_float, GL_EXT_compressed_ETC1_RGB8_sub_texture,
    GL_EXT_discard_framebuffer, GL_EXT_draw_buffers,
    GL_EXT_draw_buffers_indexed, GL_EXT_draw_elements_base_vertex,
    GL_EXT_frag_depth, GL_EXT_geometry_point_size, GL_EXT_geometry_shader,
    GL_EXT_gpu_shader5, GL_EXT_map_buffer_range, GL_EXT_multi_draw_arrays,
    GL_EXT_polygon_offset_clamp, GL_EXT_primitive_bounding_box,
    GL_EXT_read_format_bgra, GL_EXT_robustness,
    GL_EXT_separate_shader_objects, GL_EXT_shader_integer_mix,
    GL_EXT_shader_io_blocks, GL_EXT_shader_samples_identical,
    GL_EXT_tessellation_point_size, GL_EXT_tessellation_shader,
    GL_EXT_texture_border_clamp, GL_EXT_texture_buffer,
    GL_EXT_texture_compression_dxt1, GL_EXT_texture_cube_map_array,
    GL_EXT_texture_filter_anisotropic, GL_EXT_texture_format_BGRA8888,
    GL_EXT_texture_rg, GL_EXT_texture_sRGB_decode,
    GL_EXT_texture_type_2_10_10_10_REV, GL_EXT_unpack_subimage,
    GL_INTEL_performance_query, GL_KHR_blend_equation_advanced,
    GL_KHR_context_flush_control, GL_KHR_debug,
    GL_KHR_robust_buffer_access_behavior, GL_KHR_robustness,
    GL_MESA_shader_integer_functions, GL_NV_draw_buffers,
    GL_NV_fbo_color_attachments, GL_NV_image_formats, GL_NV_read_buffer,
    GL_NV_read_depth, GL_NV_read_depth_stencil, GL_NV_read_stencil,
    GL_OES_EGL_image, GL_OES_EGL_image_external, GL_OES_EGL_sync,
    GL_OES_compressed_ETC1_RGB8_texture, GL_OES_depth24, GL_OES_depth_texture,
    GL_OES_depth_texture_cube_map, GL_OES_draw_buffers_indexed,
    GL_OES_draw_elements_base_vertex, GL_OES_element_index_uint,
    GL_OES_fbo_render_mipmap, GL_OES_geometry_point_size,
    GL_OES_geometry_shader, GL_OES_get_program_binary, GL_OES_gpu_shader5,
    GL_OES_mapbuffer, GL_OES_packed_depth_stencil,
    GL_OES_primitive_bounding_box, GL_OES_rgb8_rgba8, GL_OES_sample_shading,
    GL_OES_sample_variables, GL_OES_shader_image_atomic,
    GL_OES_shader_io_blocks, GL_OES_shader_multisample_interpolation,
    GL_OES_standard_derivatives, GL_OES_stencil8, GL_OES_surfaceless_context,
    GL_OES_tessellation_point_size, GL_OES_tessellation_shader,
    GL_OES_texture_3D, GL_OES_texture_border_clamp, GL_OES_texture_buffer,
    GL_OES_texture_cube_map_array, GL_OES_texture_float,
    GL_OES_texture_float_linear, GL_OES_texture_half_float,
    GL_OES_texture_half_float_linear, GL_OES_texture_npot,
    GL_OES_texture_stencil8, GL_OES_texture_storage_multisample_2d_array,
    GL_OES_vertex_array_object, GL_OES_vertex_half_float,
    GL_OES_viewport_array

40 GLX Visuals
    visual x bf lv rg d st colorbuffer sr ax dp st accumbuffer ms cav
  id dep cl sp sz l ci b ro r g b a F gb bf th cl r g b a ns b eat
----------------------------------------------------------------------------
0x041 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x042 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x0ec 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
0x0ed 24 tc 0 32 0 r . . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
0x0ee 24 tc 0 32 0 r . . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x0ef 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
0x0f0 24 tc 0 24 0 r . . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
0x0f1 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x0f2 24 tc 0 24 0 r . . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x0f3 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 16 16 16 16 0 0 Slow
0x0f4 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x0f5 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 16 16 16 0 0 0 Slow
0x0f6 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 4 1 None
0x0f7 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 8 1 None
0x0f8 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 4 1 None
0x0f9 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 8 1 None
0x0fa 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 4 1 None
0x0fb 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 8 1 None
0x0fc 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 4 1 None
0x0fd 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 8 1 None
0x0fe 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
0x0ff 24 dc 0 32 0 r . . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
0x100 24 dc 0 32 0 r . . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x101 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
0x102 24 dc 0 24 0 r . . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
0x103 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x104 24 dc 0 24 0 r . . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x105 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x106 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 16 16 16 16 0 0 Slow
0x107 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x108 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 16 16 16 0 0 0 Slow
0x109 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 4 1 None
0x10a 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 8 1 None
0x10b 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 4 1 None
0x10c 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 8 1 None
0x10d 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 4 1 None
0x10e 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 8 1 None
0x10f 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 4 1 None
0x110 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 8 1 None
0x0ab 32 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None

64 GLXFBConfigs:
    visual x bf lv rg d st colorbuffer sr ax dp st accumbuffer ms cav
  id dep cl sp sz l ci b ro r g b a F gb bf th cl r g b a ns b eat
----------------------------------------------------------------------------
0x0ac 0 tc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
0x0ad 0 tc 0 16 0 r . . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
0x0ae 0 tc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
0x0af 0 tc 0 16 0 r . . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
0x0b0 0 tc 0 16 0 r y . 5 6 5 0 . . 0 24 8 0 0 0 0 0 0 None
0x0b1 0 tc 0 16 0 r . . 5 6 5 0 . . 0 24 8 0 0 0 0 0 0 None
0x0b2 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
0x0b3 24 tc 0 32 0 r . . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
0x0b4 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x0b5 24 tc 0 32 0 r . . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x0b6 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
0x0b7 24 tc 0 24 0 r . . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
0x0b8 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x0b9 24 tc 0 24 0 r . . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x0ba 0 tc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
0x0bb 0 tc 0 16 0 r y . 5 6 5 0 . . 0 16 0 16 16 16 0 0 0 Slow
0x0bc 32 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x0bd 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 16 16 16 16 0 0 Slow
0x0be 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x0bf 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 16 16 16 0 0 0 Slow
0x0c0 0 tc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 4 1 None
0x0c1 0 tc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 8 1 None
0x0c2 0 tc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 4 1 None
0x0c3 0 tc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 8 1 None
0x0c4 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 4 1 None
0x0c5 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 8 1 None
0x0c6 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 4 1 None
0x0c7 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 8 1 None
0x0c8 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 4 1 None
0x0c9 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 8 1 None
0x0ca 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 4 1 None
0x0cb 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 8 1 None
0x0cc 0 dc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
0x0cd 0 dc 0 16 0 r . . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
0x0ce 0 dc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
0x0cf 0 dc 0 16 0 r . . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
0x0d0 0 dc 0 16 0 r y . 5 6 5 0 . . 0 24 8 0 0 0 0 0 0 None
0x0d1 0 dc 0 16 0 r . . 5 6 5 0 . . 0 24 8 0 0 0 0 0 0 None
0x0d2 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
0x0d3 24 dc 0 32 0 r . . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
0x0d4 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x0d5 24 dc 0 32 0 r . . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x0d6 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
0x0d7 24 dc 0 24 0 r . . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
0x0d8 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x0d9 24 dc 0 24 0 r . . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x0da 0 dc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
0x0db 0 dc 0 16 0 r y . 5 6 5 0 . . 0 16 0 16 16 16 0 0 0 Slow
0x0dc 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
0x0dd 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 16 16 16 16 0 0 Slow
0x0de 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
0x0df 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 16 16 16 0 0 0 Slow
0x0e0 0 dc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 4 1 None
0x0e1 0 dc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 8 1 None
0x0e2 0 dc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 4 1 None
0x0e3 0 dc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 8 1 None
0x0e4 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 4 1 None
0x0e5 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 8 1 None
0x0e6 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 4 1 None
0x0e7 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 8 1 None
0x0e8 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 4 1 None
0x0e9 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 8 1 None
0x0ea 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 4 1 None
0x0eb 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 8 1 None
```

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.24.2-0ubuntu6
ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
Uname: Linux 4.10.0-22-generic x86_64
ApportVersion: 2.20.5-0ubuntu4
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Jun 7 07:30:40 2017
DisplayManager: lightdm
InstallationDate: Installed on 2017-06-03 (3 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170602)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Yeah I noticed too; gnome-shell is surprisingly inefficient.

The good news is that v3.25 aims to make things more efficient, so that's something to look forward to.

Just a note: The exact CPU usage will depend on your CPU model and what apps you're running (not just the Gnome version). I experience 20%+ CPU usage by gnome-shell on a high-end Xeon desktop, just while it's redrawing the screen, which is surprisingly bad. But it will take some time before the upstream optimizations trickle into Ubuntu, and before I have time to look at more detailed optimizations in future.

[Daniel van Vugt (vanvugt)]

Also note:

Xwayland is using high CPU because you're running Firefox.

Firefox is using high CPU because, well, it's Firefox.

So you can ignore those two.

[Daniel van Vugt (vanvugt)]

Note gnome-shell's performance problems relate to redrawing the screen (ie. when anything on screen is changing).

For example: CPU usage playing Big Buck Bunny 1080p 60FPS:

Unity7/Xorg (fullscreen)
totem 80%
compiz 4%
Xorg 5%

Unity7/Xorg (windowed)
totem 80%
compiz 6%
Xorg 4%

Gnome/Wayland (fullscreen)
totem 120%
gnome-shell 40%

Gnome/Wayland (windowed)
totem 120%
gnome-shell 40%

You can ignore 'totem' - its performance is different probably because the Wayland code path is not yet as efficient as the Xorg one. The relevant point is that gnome-shell uses 4x the CPU of Xorg+compiz to draw the same thing...

[Daniel van Vugt (vanvugt)]

And in case anyone was interested:

Xmir/mir_proving_server (windowed)
totem 80%
Xmir 4%
mir_proving_server 2%

[Daniel van Vugt (vanvugt)]

It appears the high CPU of gnome-shell with totem on Wayland at least is due to the totem app window redrawing at 60Hz seemingly only on Wayland (bug 1698282). When this happens, the compositor will have to upload (copy) the window texture from CPU to GPU 60 times per second, which is CPU-intensive. This would happen with any software ("shm") surface that is large and redrawing frequently. So I guess that might include Firefox too.

[RussianNeuroMancer (russianneuromancer)]

This issue could be related: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1716434

[KANGOD (kangod)]

It affects me too.

I'm on Ubuntu 17.10. Closing all apps but System Monitor, then moving the mouse up and down on the icons in Dock bar, keeping on, and my i7-8700k will be rapidly consumed 80+% even 90+%.

[monomakh (monomakh)]

Switch off the second monitor solve high CPU usage for me

[Heinz Dieter (heynz)]

I also experienced increases load on my laptop with an external monitor in addition to the built-in screen. The load is low initially, then increases such that the fan turns on. Disconnecting the extra monitor reduced the load 30s after unplugging for me.

[Daniel van Vugt (vanvugt)]

I think this bug is about the single monitor case. Please open a new bug for the multi-monitor case.

[Daniel van Vugt (vanvugt)]

This bug is probably a bit out of date now. I don't see problems as bad any more.

Rasmus: Please test again with the latest firefox (I think the newer versions ~57 or so are much more efficient). And if you can, also test Ubuntu 18.04: http://cdimages.ubuntu.com/daily-live/current/

Everyone else: Please log your own new bugs using this command: ubuntu-bug gnome-shell
and also mention which apps cause high CPU usage of gnome-shell.

[Rasmus Eneman (pie-or-paj)]

The above bug seems to be solved or at least mitigated a bit. With just having firefox up the CPU usage of gnome-shell is between 2-5%.

Gnome shell is still much less performant than Unity though, by moving windows, open Activities or dragging the mouse over the dock its CPU usage quickly jumps to 20%. But that is probably things that should have their own bugs.

[Daniel van Vugt (vanvugt)]

Rasmus: I think other people have reported performance problems with the Activities overview already. Maybe you should join bug 1698792 to discuss that one. I think upstream Gnome bugzilla has reports of it too.

Let's keep this one about gnome-shell's CPU usage while Firefox is running.

It's important to be very specific with performance bugs and divide them up into narrower use cases so that fixes don't become subjective, and so multiple people can verify the performance of some feature is indeed fixed.

I think this particular issue with Firefox spiking gnome-shell's CPU is fixed. We can just leave this Incomplete now and if there is no recurrence or further comments the bug will close itself.

[pierre (dubiaj)]

This bug is affecting me as well. I just ran `ubuntu-bug gnome-shell`, hopefully you can see my files?

[Alex B (aalleexx)]

Sorry I'm totally newbie here and with ubuntu, but I regularly face the same problem with Ubuntu 17,10 in Virtualbox, when I run eclipse:
Version: Oxygen.2 Release (4.7.2)
Build id: 20171218-0600

Either this happens at startup of Eclipse, or after a while with no obvious reason...
Seems this is unrecoverable. _in the case it happened at startup of Eclipse, top reached up to 95% load for gmome-shell, and minimum was 70%. After 10 minutes, I gave up and restarted the machine.

Not sure how to help more for now :/

[Daniel van Vugt (vanvugt)]

This bug is about the Firefox case only now.

If you have any other problems then please open a new bug.