[Fixup]

After flashed mine to GrooveRom, the performance is good but battery life is still poor, even after I removed all the unnecessary running programs. In TaskManager3.1, I see some programs (shell, cprog etc.) are using quite lot of CPU time. I'm going to give this MightRom3.9 a try.

Update: I think what affects battery life the most is radio signal. Now with this MightyRom3.9 I see for the first time full antenna bars on my Diamond! Before with other ROMs I saw 1 bar only. We all know when signal is low, phone drains battery quick and runs hot. All my phones get full bars; I thought Diamond's reception was very poor, did not think a ROM could make such a huge difference. This ROM is thoughtfully cooked, my cup of tea.

Some programs use too much CPU time while idle and thus drain battery constantly, such as IBM J9, JBlend, Tao Intent. JBed and Jeodek use almost no CPU time while idle, therefore my choice of JVM. TaskManager3.1 and acbTaskMan can be used to discover those poorly programmed programs, but some programs such as J9 will crash them.

Oh, just encountered the first freez. This MightyRom needs some more cooking.