did you try these:
especialy the one about removal of the cell standby service?
also, which firmware are you using?
If you have 4GB internal memory you may need the firmware with 'HY' in the name.
If you have a 2GB model or a older 4GB model you should try the firmware from 2010/11/30 or 2010/11/18 (i prefere the last one)
also for a fast pad you should disable as many widgets as you can and maybe experiment with a Task killer app.