Purging the Buffer??
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 This post is deleted!
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 (still having problems attaching the file, i'll try it zipped) 
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 I tried your patch on a late 2013 MacBook Pro with Sierra for about 4 hours and had fps 24.5 -25 with a target of 25. I was using Isadora 2.6.1 Best Michel 
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 thanks Michel, i just tried a 2 hour test with 2 samplers getting triggered randomly, no problems. i'll try and recreate the original patch and conditions and see what happens.... 
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 OK - my bad. its not the Buffers that are the problem. during the show I had a 3D Model Particles running as well - something I got from @Skulpture - I just tested this (on its own)(with no 3D model) and it slowed down to 14fps after an hour. 
 
			
		