well depends what you play... if you play full ring 2-3 tables is meh... its so slow.... i would play more than 9 but than tables are really small... (24 inch monitor) so untill i get bigger one 4 zoom or 9 reg 6max is top altho i think i play much better in 2 zoom/4 reg....I read 10-20 tables ... it's crazy for me! maxymalnie I play on 4, but if everything is moving very quickly it's too much for me. if you do not have to make very quick decisions can be 4 to play.
prefer 2 max 3 - can get well over all and do not think ill do foolish mistakes.
I really admire those who say that they can play simultaneously on 10-15-20 tables - everything has to happen so fast that I think I would not keep up.
I greet
10 pokerstars aint as good now the tables overlap and i find myself sitting out alot.