GEM is set to VBL sync based on your monitor's refresh rate.  I vaguely recall putting some sort of message about turning this on and off in the gemwin.  With it off you will often see horrible tearing artifacts on the display, which is why it defaults to 'on' on OSX (and apparently Linux too).  

On Wed, May 30, 2012 at 3:15 PM, William Brent <william.brent@gmail.com> wrote:
Hi list,

I'm trying to get the fastest possible frame rate from GEM, and seem
to be hitting a limit of 60fps.  Is this a known limit?  I searched
the documentation and pd-list archives, but maybe I'm missing
something.  The final application I'm working on is video tracking,
but here's a test patch with nothing more than a gemwin and a counter
incremented by the gemhead.  With a frame rate of 90 for the gemwin,
it takes exactly 3 seconds to get the counter up to 180, when it
should only take 2 seconds.  At a frame rate of 60, it takes the
expected 2 seconds to get the counter to 120.

I'm running this with Pd-0.43-2 and GEM 0.93.3 on Ubuntu 12.04 using
the -noaudio flag.  I get the same results on Mac OS 10.6.8.


--
William Brent
www.williambrent.com

“Great minds flock together”
Conflations: conversational idiom for the 21st century

www.conflations.com

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