[stu aull]"Can you - how DO you - assign ram use to an application?
In OS9 you could do this, but how in Tiger??
Want to make sure my FCS Motion is getting lots of juice."
One of the benefits of Mac OS X is vastly improved memory management, so the manual assignment of RAM is no longer necessary. Applications will be allocated RAM as they need it without you having to intervene.
Having said that, sometimes poorly behaved applications don't release RAM that they're no longer using, so I find it useful to quit any apps that aren't necessary to the active process (if it's going to be memory-intensive).
Additionally, it is possible to tell the system to give CPU priority to a specific app via command line, or with a GUI app that does the same thing: