Hello friend, You can use the program I posted below to help clear up some memory. Its called cleanram. I recommend you go to the settings and set it to run level 2 (it takes a little bit longer but does a better job)
You can install the ssk tp2 dynamic resource proxy cab (this will help speed your device up a little bit)
You can also turn off your push internet and turn opera always on off this will help a lot. (i dont remember exactly how to do these anymore since I did it a while back but there are several forums here that have instructions posted.)
Enjoy! and if you ever shop online and I wanna get a little cash back check out the link in my signature.