I got to 2 tables pretty quickly, but by the death of me I couldn't move beyond that. I got headaches almost instantly. But a little while ago I managed to move up to 3. Dunno how.. I just put each table in a definite space where I can see each one so that I'm able to keep track of each table in one location. I place them in such a manner that I can see my hole cards in all three tables at once.

I think I can probably move up to 4 tables, but due to exams I haven't been playing much if at all, so that'll be for later.

And I just discovered, inspired by this thread, that I can switch the table size to become smaller on prima. Lol! Ok that's gonna help in the future.. with mini-view I can probably fit a whole bunch of em on my laptop screen. Nice!