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On Feb 6, 2004, at 5:12 pm, Tim Mooney wrote:


I haven't played with OS X enough to know, but does its X server support
the Render extension? If not, that's probably why GTK+ 2 is slower.

number of extensions: 28 Apple-DRI Apple-WM BIG-REQUESTS DEC-XTRAP DOUBLE-BUFFER DPMS Extended-Visual-Information FontCache GLX LBX MIT-SCREEN-SAVER MIT-SHM MIT-SUNDRY-NONSTANDARD RECORD RENDER SECURITY SGI-GLX SHAPE SYNC TOG-CUP X-Resource XC-APPGROUP XC-MISC XFree86-Bigfont XINERAMA XKEYBOARD XTEST XVideo

It seems so. Hard to tell for me whether this is just the API
extension or a hardware accelerated implementation. Do you have
any idea how to gather this data?

I've noticed this too, using an X server on a commercial UNIX platform.
Owen has talked about performance improvements for non-Render platforms,
and I'm certainly hoping they become a reality in the next year.

Meanwhile I've profiled gnumeric while waiting for the scrollwheel
action to catch up and indeed it seems that the scrolling causes a lot
of activity both in GTK and the X server with the activity in the X
server being mostly blit operations resulting in memcpys. So it seems
that updates are a really costly operation which should be better avoided
and actions to cause them reduced by coalescing and/or grouped...


- --
Servus,
      Daniel
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