If you're running a CDMA device, there's a new 6.1 ROM released by dcd, who was my favored diety when I had a Titan. I can confirm no keyboard lag. You can find the thread, started by t0mmyr, here:
http://forum.ppcgeeks.com/showthread.php?t=69754
Direct link to the ROM download location here:
http://dcd1182.n715dp.com/index.php?dir=hermann/
And if you have a carrier other than Sprint, try downloading one of the carrier cabs from the Titan to force the data connection to work:
http://dcd1182.n715dp.com/index.php?...%2Fcarriers%2F