The majority of the slowdown was a combination of snapcraft's lack of connection preservation and slow DNS resolution of the builder proxy due to a possible BIND bug. IS has applied a workaround for the BIND problem, fixing much of the latency and most of the build slowdown.
US-based builds (ARM, POWER and z) should now succeed, though they won't be perfectly fast. We can't fix the remaining latency or bandwidth issues without the restoration of connection preservation in snapcraft.
The majority of the slowdown was a combination of snapcraft's lack of connection preservation and slow DNS resolution of the builder proxy due to a possible BIND bug. IS has applied a workaround for the BIND problem, fixing much of the latency and most of the build slowdown.
US-based builds (ARM, POWER and z) should now succeed, though they won't be perfectly fast. We can't fix the remaining latency or bandwidth issues without the restoration of connection preservation in snapcraft.