this has always been my question since I've moved to the TP2. One thing you may want to do is define what you mean by fast. For me it means snappiness of OS functions and changing screens and specifically in regards to texting, emailing and sliding the keyboard in and out (i.e. screen transitions). To other people it's how well youtube plays etc... On the TP for me it was DCD's 6.1 ROM. I haven't found a TP2 ROM that's sole purpose was to be zippy. I'd like too if anyone knows it. That or if anyone can point me to an article on how to upgrade to a Snapdragon chipset
