First, I LOVE ReadyBoost and if any of you have memory card readers (SD, MS/Pro, MMC, SM, XD, etc.) pick up a XD or the cheaper SD card and use it in there... nothing sticking out and you always have a huge boost.  But my question is, would the read cache, under the device properties, hardware tab, policies, when set to "Optimize for performance" reduce the performance of ReadyBoost?  My understanding of this feature is it would as the contents of the drive would be cached in the system memory.  Any thoughts or ideas?

- Tim