Confused after a switch... Reaper doesn't work with Mac OS Snow Leopard ?

Hello ! I recently switch to a 10.6.3 OSX IMac, 3.06Ghz with 8Gb RAM, coming from an old PC under XP SP3 that was decently running Reaper. But I was asking too much and decided to switch to a full-power brand new machine. Some kind of bad idea... I've got the feeling the some other users are experiencing the same. Apart from using my POD X3 to record guitars (plugged in USB on the MAC), I use EZDrummer & Arturia Minimoog V plugins. I also do have an EMU 0404 USB external sound card but it doesn't work with my Mac, I've turned it off. Anyway, the POD X3 allows me to in/out my sound and it's OK. Reaper for MacOS is pretty often consuming all my CPU (sometimes higher than 100% !). As soon as launched, I can jump to 40%, with almost nothing in it. If I had some audio files & 1 EZdrummer line, it fails and I'll have glitches & crackles. It starts playing back correctly and suddenly, no more sound. And so on... I do love Reaper from my past experience on the PC but I must admit it makes no sense working with it on the Mac OS as-is. Do you think it's something related to the fact I don't use a decent soundcard ? Does a Motu Ultralite Mk3 would help (I may buy one if needed) ? Something related to a misconfiguration on the Mac ?

Sounds odd, I'm running a MacBook 2.4 with 4gig of ram and it goes like train, am hard pushed to run anywhere near 25% with EZDrummer and EZD Perc, plus 30 tracks of 24/44 audio and loads of FX. Mmm...

@BobM : - what soundcard do you use ? - Do you have any kind of special setting on your Mac for audio ? - And do you use special Reaper settings ? especially for plugins ? I'm more or less always bugged by bridging and so. Any advice very welcome :o) Maybe at some point I'm so used to Reaper on PC that I didn't carefully watch all setting options or so. If you could screenshot or list me your settings, I'd really appreciate !

I use a MOTU Traveler with a Focusrite Octapre via ADAT, but I don't use any soft synths etc. You could try a re-install with the latest version of Reaper but without any external plugins and then work up from there, I don't use any irregular settings apart from my own "Actions", recording at 24/44.1. Are your plugins VST for Mac?

I use reaper with ezdrummer and more vsti's. My audio interface is apogee duet. The performance of reaper is excellent, never reaches 30% of cpu with six or seven tracks, vsti's plus audio.

Hi again ! Thanks for your answers. MBob & Parr, would you mind copying me screenshots of your actual plugins settings ? I may be part of my issues..?! I've tried many things, with AUs and VSTs wrapped with FXpansion and all same results. Surely I'm doing something wrong but I can't figure out what.

Ok, I got it, some work fine, some don't, but the question is: How hard are you pushing it? Maybe it's the plugins I'm using... Let's try to find out what exaclty is causing the problem.

I found that AU plugins were always making the bridging icon appear in the dock and that the performance was awful. Stop using any AU plugins, only vst,- and make sure none of them are bridged and see if that helps. I've turned off the bridging but it still fires up when scanning for plug ins,- I rather rip the whole chunk of code out 'cos it seems unhelpful to me as it is now. Even disabling it with preferences option doesn't really disable it. Kind regards Dave Rich

check yesterday evening on my iMac (10.6.3) : it's the x86 thing that stays forever. Is it normal ?

Just to make sure, did You install the 64-bit Reaper?