Are you talking about messages as in SMS text composition?
I'm suffering from moderate-medium lag with hardware keyboard entry in the text field with threaded sms. Everything else works fine and there isn't lag, but texting is slow, with the characters showing up a good 10 or 12 seconds after I've pressed them after I really get going.
I searched around and found some stuff on the xda-devs site:
http://forum.xda-developers.com/show...=428144&page=3
But turning wifi power management settings to all three positions doesn't help, and I don't have wifi enabled. It just seems slow. I disabled T9 per all the instructions, but I know it is still learning my words. Fn-space brings up the T9 menu.