#19276: Scrolling is slow and CPU intensive -------------------------------------------------+------------------------- 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: -------------------------------------------------+-------------------------
Comment (by yawning): Replying to [comment:14 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. Well, same sort of problem. I don't think that supports any of the relevant acceleration methods well enough (if at all), so you're probably stuck on some sort of software rendering regardless. > 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. One thing worth looking at for your specific case is disabling the off- main thread compositing (Enabled in FF40, so the 6.0.x series would be the first Tor Browser releases to support it. See https://bugzilla.mozilla.org/show_bug.cgi?id=994541). Try setting `layers.offmainthreadcomposition.enabled` to `false`. Behavior is noticeably different on my Poulsbo Atom box (using the open source 2D only drivers). Unfortunately, if I were a real Tor Browser person, I'd probably push against making the modified version of the pref the default even if it helps the 2d only configs since doing so will likely hurt more configs than it helps. -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19276#comment:15> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online _______________________________________________ tor-bugs mailing list tor-bugs@lists.torproject.org https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-bugs