Well, I had a N900 with a pretty old installation, lot of programs from devel etc, and for example running 8 MicroB windows was sluggish as hell. After installing this and trying the same thing (not to mentioning actually doing other stuff with them open), it was amazing. It was like having sex for the first time (metaphorically), this is how this phone should've been from the start. I'm currently reflashing, and this is among the first things on my to-do list (after repartitioning and kernel power etc ofc).

Also take into consideration what this patch does; it improves performance for the currently relevant user processes. As far as I'm aware it won't speed up starting a program, it will speed up running it. I also have HWSync on so scrolling is pretty smooth anyways.