[PD] latency issue

[babsyco babsyco]

Hi guys-I just have another fairly simple question. I'm running PD on a macbook pro with a 2.26 Intel Core 2 duo processor, 2 gig of memory 1067 MHz DDR3, and I'm using a terratec Phase 24FW external sound card. On my other computer (which was far inferior) using this soundcard with Cubase I had a latency of around 6ms (I couldn't get PD to run on it so I have no basis for comparison there), but running PD on this new setup I can't get the latency down below 20ms with it turning to mush. What do I need to change to get the latency down below 10ms-the soundcard, more ram, or is the processor just too slow?
Thanks so much.Babsyco. 		 	   		  
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