I'm keen to hear suggestions from those of you using Csound for live performance for the most CPU efficient audio filter opcodes or ways of using them. 

Simply after quite standard multimode type filters. Must include LP, BP, HP and Band reject if possible. The patch I'm currently running is pushing my machine quite hard hence I'm after any advice on the "lightest" way of doing this or any tips on how to setup the usual suspects for optimal performance. It's only for filtering either mono or stereo samples or live audio input. The live input is rarely ever stereo if that makes a difference. 

Any ideas, tips or suggestions greatly appreciated. 

Dominic