i really can't tell the difference in speed between 6.5 and 6.1, but i use 6.5 for the lock screen/in call screen and new start menu. Now i cannot live w/o!!!!!!
sorry to the developers but i was really disappointed w/ MightyROM 5 and Juicy 7. i loved these two developers 6.1 roms but people like Merdin have given me a much better 6.5 experience