importing telepathy is slow

[tomeu]

Takes 12.5% of the total startup time of a minimal activity. See #5228 for more details and a profile.

Perhaps we should discuss it for update.1, as could be low hanging fruit that could help significantly activity startup.

[smcv]

Reassigning to morgs, Cc the Collabora OLPC team, since I'm not currently working on OLPC.

[mtd]

takes 13 seconds to import telepathy (see [#5228 comment]) in update.1 690.

[mtd]

1.3 seconds, sorry.

[tomeu]

Take in account that these 1.3 seconds is not what it takes to an activity to import telepathy, as it includes the import of several modules that need to be imported anyway.

So, the right way of calculating the impact of one import is to see which other modules it imports and subtract the time taken by those modules that need to be imported from other parts of the activity.

Attached is a file with all the modules imported by a very simple activity, taken with 'python -v sugar-launch <activity name>'.

If we wanted to know how much impact has the telepathy module in activity startup, we would need to move the imports caused by 'import telepathy' to the end, and time those.

[mstone]

This is does not need to be fixed in 8.2.0 because the the rainbow module importing hack masks the performance problem.