I've been playing with Ardour on OSX for a while now, and I've been pretty happy, once I got a few details worked out.
One problem I have right now is that whenever I have any plugins running, they generate crackles and pops during playback, and even on export.
I don't think its taxing my system that badly, since Ardour itself is only showing a DPS load of usually around 5%, and Jack is rarely above 10% CPU load. According to top (or Activity Monitor if you prefer the GUI tool), Ardour usually uses abotu 18% CPU during playback.
Those numbers only dip marginally when I disable all my plugins, but all the crackling goes away. Turn any of the plugins on again? The crackle comes back.
I don't know what else to look at - am I missing something?
Jack settings: Sample rate at 44.1, buffer size is 512.
Any idea as to what I should be looking at?