I loaded PI Server 2010 SP1 (64-bit) and PI System 2010 R3 (AF 2.4) with event frames, both of which includes PISDK 2010 R2 (188.8.131.526), and must say that I like the speed improvements so far. In fact, I wasn't expecting such improvements so I didn't try to capture any Stopwatch timings of before and after on my laptop. But the combination of products seems to be more than twice as fast as before. Disclaimer: take it with a grain of salt as the measuring device is my own perception.
Good job to all involved!