[cairo-bugs] [Bug 49534] New: [nvidia-302] Slow chromium tab switching with cairo-1.12.0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49534

             Bug #: 49534
           Summary: [nvidia-302] Slow chromium tab switching with
                    cairo-1.12.0
    Classification: Unclassified
           Product: cairo
           Version: 1.12.2
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: xlib backend
        AssignedTo: cworth at cworth.org
        ReportedBy: makovick at gmail.com
         QAContact: cairo-bugs at cairographics.org


Created attachment 61077
  --> https://bugs.freedesktop.org/attachment.cgi?id=61077
Cairo trace for chromium

With more tabs containing complex content (reproducible eg. with 4 tabs with
cnn.com), switching between tabs takes 1-2 seconds. I was hoping it's for the
same reason as in Bug 48395, but this problem persists with nVidia 302.07 beta
driver too.

Related bug report in Chromium bug tracker:

http://code.google.com/p/chromium/issues/detail?id=121624

Cairo-perf-trace output with nVidia driver 302.07:

$ cairo-perf-trace chromium.18279
[ # ]  backend                         test   min(s) median(s) stddev. count
[  0]      xcb                     chromium    1.973    1.987   0.62%    6/6
[  0]     xlib                     chromium    3.840    3.870   0.35%    6/6
[ # ]    image: pixman 0.24.4
[  0]    image                     chromium    0.073    0.075   1.37%    6/6
[ # ]  image16: pixman 0.24.4
[  0]  image16                     chromium    0.089    0.090   0.51%    6/6

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