[tbb-bugs] #19276 [Applications/Tor Browser]: Scrolling is slow and CPU intensive

Tor Bug Tracker & Wiki blackhole at torproject.org
Wed Jun 8 11:19:25 UTC 2016


#19276: Scrolling is slow and CPU intensive
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 Reporter:  cypherpunks                    |          Owner:  tbb-team
     Type:  defect                         |         Status:
 Priority:  Medium                         |  needs_information
Component:  Applications/Tor Browser       |      Milestone:
 Severity:  Normal                         |        Version:
 Keywords:  tbb-6.0-issues, tbb-usability  |     Resolution:
Parent ID:                                 |  Actual Points:
 Reviewer:                                 |         Points:
                                           |        Sponsor:
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Comment (by cypherpunks):

 Replying to [comment:3 gk]:
 > I guess this is on a Windows OS? Which version? Do you see error output
 or something on the browser console (Ctrl + Shift + J) while scrolling?
 Sorry for not mentioning the platform. The issue occurs on a Debian
 testing box. There was nothing in the browser console besides unrelated
 messages.

 I've done some more testing to try and find why there was a difference
 between Firefox and TB. Unfortunately the previous comparison wasn't
 accurate as the Firefox instance i used was heavily modified. Using a
 clean profile made the issue appear with Firefox too so it's not TB
 specific.

 Turns out issue is solved by setting `gfx.xrender.enabled` to `false`.
 Because I'm unfamiliar with the Firefox code base, i don't know what the
 preference does, what its impact is, and whether it's worth setting in TB.
 Hopefully someone else can figure this out.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19276#comment:4>
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