1294968 - [e10s] Increased CPU use during startup

Status: RESOLVED DUPLICATE of bug 1295214

(Toolkit :: Startup and Profile System, defect)

Description

[The 8472]

Attachment: startup cpu time.png

Currently: During session restore the both parent and child process are using 1 core each. The child process does not grow in footprint during that time, so presumably no content is loaded yet at that point.

Previously: Only the parent process would burn CPU time while creating (lazy-loaded) tabs

Comment 1

[Loic]

On the French community board, I read a post about the same issue with e10s enabled (very partially) in FF48.
https://forums.mozfr.org/viewtopic.php?p=825036#p825036

Comment 2

[The 8472]

Note that i observed this behavior changing between nightly versions somewhere in the last few weeks and e10s was always enabled. So I doubt it's related to the 48 release.

I have lots of lazy background tabs, so I suspect they somehow trigger work on the child process despite being loaded in the parent process during session restore.

Comment 4

[Jim Mathies [:jimm]]

This might not be a good match from your description, if you're still seeing it please reopen.

Comment 5

[The 8472]

current nightly does not exhibit that behavior anymore.