Dave Kessler say that the following changes were made:

• 1.4.1 - Revised CF bytes used/free computation to improve speed when copying multiple databases to CF. Fixed driver problems when used with CF cards larger than 64MB.
• 1.4.2 - FALib optimization to speed up CF read/write operations.

Initially, these seem like modest improvements from a modest guy.  But, I ran my benchmarks again and was astonished to see the results.  If your concerned about speed like Kopsis Engineering is, you'll be very happy.  This is one of the benefits of an module like the FlashPlus, the software will be constantly updated, and every once in a while, you'll see improvement like this.  These results were achieved on an un-accelerated Visor Prism with the CFTiming Setting set to "Max Speed."

FAFileMover does some optimizations in the background, hidden from the users. But you do have some control.  

For example, in the Settings dialog there is an option for CF Timing. You can select Max Speed or Min Power. According to Kopsis Engineering, CompactFlash cards allow you to select the power level they should run at. Higher power levels are faster but will drain batteries quicker. The range available depends on the CF card itself.