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nixarn

The framerate was horrible on my quite new iMac

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Same on a previous generation i5 Air. Using Google Chrome v21.0 (as silly as that version number sounds...)

Hi, can I ask which browser you are using?

The framerate is terrible for me too (looks ~5 FPS), newish MacBook Pro.

MacBook Pro (15-inch, Early 2011)

  Processor  2 GHz Intel Core i7
  Memory  8 GB 1333 MHz DDR3
  Graphics  AMD Radeon HD 6490M 256 MB
  Software  OS X 10.8 (12A269)

  Darwin Kernel Version 12.0.0: Sun Jun 24 23:00:16 PDT 2012; root:xnu-2050.7.9~1/RELEASE_X86_64 x86_64

In both:

  Google Chrome Version 21.0.1180.77 beta
  Mozilla Firefox 14.0.1

Edits: updated formatting and newlines. I don't see an option to enable high performance graphics in Mountain Lion, but I tried disabling auto-switching of graphics and it has the same issue.

Hmm, that seems unusual. I'm running a Late 2008 MBP and I get between 20-40FPS in Chrome and similar in FF. Though my machine has 512MB GPU RAM, so it's possible that you are running out of space for textures. There's still work to do there. :-)

Another thing that might cause problems is the the Energy Saver preferences. You need to ensure that the graphics option is set to Higher Performance. (At least in 10.7 you do)

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