It always depends on my BR to be honest and the amount of Buy-Ins I have @ said level.
So when I had near $2k last year on Party on Party and I was playing @ the $5.50 mtts on that site, I was doing the max on that site that my comp could handle prior to lagging and so forth and so on, Yet when I had $500 on Stars on the same comp I was able to do up to 16 games at a time, so either 16 MTTs or 16 tables of STTs and so forth and so on.
It's actually easy to tile It and get use to It. over time. The most tables I've ever done was 36 tables of hyper 6 max STT "FTW", that was an Insane experience and I was actually "Timing out on majority of the tables", lol.