Comment 13 for bug 1235190

There are various causes of slowdowns; Mir is slightly slower than SurfaceFlinger on rendering, but that's expected and performance optimizations are upcoming (post-13.10). One known reason for slow downs is when crash files are being written; typically if a large process crashes, the phone is stuck for a while writing the .crash file.

Lastly, there's a known memory hog in upstart using all memory very rapidly on Mir builds, notably mako; this is being worked on.