If you are experiencing system performance issues in ROM based File systems, here is a nice tweak to boost up the performance. Most of the times, this slowdown will be due to constant registry flushing in to ROM in background.

If this variable is set to 1, it will enable aggressive flushing of registry on to ROM. Setting it to 2 will disable background flushing and can improve performance of system significantly.

Reference: http://msdn.microsoft.com/en-us/library/aa914382.aspx