The x11perf results are a known issue, but not obviously significant. (How many apps do you have that use the X NoOperation request?) Despite our belief that the "slow" requests have almost no impact on real applications, we are working on improvements in this area.
However, I believe the bug you actually experienced with metacity is identical to #10644, which Josh and I believe is fixed in libX11 git.
Can you confirm that current libX11 fixes metacity's performance for you?
*** This bug has been marked as a duplicate of bug 10644 ***
The x11perf results are a known issue, but not obviously significant. (How many apps do you have that use the X NoOperation request?) Despite our belief that the "slow" requests have almost no impact on real applications, we are working on improvements in this area.
However, I believe the bug you actually experienced with metacity is identical to #10644, which Josh and I believe is fixed in libX11 git.
Can you confirm that current libX11 fixes metacity's performance for you?
*** This bug has been marked as a duplicate of bug 10644 ***