Whenever I am working in C1 Catalog, I tend to check email, visit a forum etc. If I go to any app, upon returning to C1, I get the spinning beach ball for a bit.
It eventually clears up, but its a little annoying.
What I have tried is turning off/on open CL support but that doesn't seem to have an effect.
Mac Pro 3.33 6 core, 24 GB ram. Latest OS, latest C1 version. Radeon 7950 graphics.