check out this Hermes support forum
http://forum.xda-developers.com/forumdisplay.php?f=355
I've been a series of cooked ROM's settling on Schaps 4.31 Rom with my JasJam & it has improved it's performance over the standard ROM incredibly. Word of warning to people considering the upgrade to read all the procedures carefully as it has the ability to 'brick' your device.
After upgrading I reload CF2 which does seem to be a backward step but essential for B4PPC. M.Zielinski - Thanks for the tip on MyProg.exe I'll try that next time.