Mironmoth wrote : > Also, try turning off the shared library extentions on your ibook - > this helped me with the CPU performance with cubaseVST32 > and the EMI. I tried without success, and it also seemed to disturb many apps. Thanks anyway. jamie+howarth wrote : > ON the I book, try disabling the Apple Enet and Apple Enet DLPI > extensions, particularly IF you have no ethernet cable plugged > into it. The Powerbooks constantly poll to see if an ethernet > connection has been established, and in so doing clobber the > CPU interrupt timing for things like USB audio interfaces. If the > PB is actually attached to a network this is no problem, but if it > isn't, it will constantly look for one, unless you turn off these two > extensions. You're right, it works ! As I wrote my first mail, the iBook was unplugged from ethernet network. I just plugged it again, relaunched Logic and it got much better : still some clicks at 6 ms, but nothing to compare with what I got before. Thanks ! Yann Le Bihan