1. New spell graphics and enemy spell graphics are causing lag, not calculations. My iPhone can handle 2.1b or more without lagging. It was not seeing Sha of Anger's health go down that caused me to lag, it was his summoning of Ire and the gazillion spells being flung toward him that caused the lag.
2. 32 bit was dying out when the idea was suggested. It's about as good as extinct now, and 64 bit will die out when we reach 9.2qui.
3. Hate the numbers? Ingame settings will help you sort that out. Seriously, you can play the game without seeing a single number above 1k if done right, if you really despise them.