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

[Tor Bug Tracker & Wiki]

#19276: Scrolling is slow and CPU intensive
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 Reporter:  cypherpunks                          |          Owner:  tbb-
     Type:  defect                               |  team
 Priority:  Medium                               |         Status:
Component:  Applications/Tor Browser             |  needs_information
 Severity:  Normal                               |      Milestone:
 Keywords:  tbb-6.0-issues, tbb-usability, tbb-  |        Version:
  performance                                    |     Resolution:
Parent ID:                                       |  Actual Points:
 Reviewer:                                       |         Points:
                                                 |        Sponsor:
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Comment (by 49ax56xr36):

 Replying to [comment:11 yawning]:
 > Everyone that actually has the issue is leaving out "what video card
 they have, and what drivers they are using if applicable".

 nxagent -- virtual screen X-server, older version

 Don't think an actual "drivers" are in the picture here, just the screen
 virtualizing X11 NX server.

 Worked reasonably well with 5.5.5 and xrender=true.  Epic disaster with
 6.0.1.  Six-oh-one with xrender=false seems a bit faster than 5.5.5 with
 xrender=true, but not different enough to cause complaint.  Does seem a
 regression in the xrender code.  Reading some of the above links it
 appears xrender is a mixed proposition.  Works brilliantly on many
 targets, not-so-great on others.  Could be a dumb bug that's imperceptible
 on fast hardware.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19276#comment:14>
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