I've done up to T4 on PS3 and garuda only of the extremes with no real noticeable lag, especially after I installed SSD. Not gonna lie before SSD primals mainly lagged, but after SSD nothing. Any lag I faced was because of my internet or SE itself.
I haven't tried T5 yet but really, I don't believe I gimped any group I was with in all the months I was playing the game. I've done it all from normal runs to speed runs and any failures are basically me screwing up.