Due to a cancelled flight, Keith is not able to make it to FOSDEM this year. This talk will therefor not be taking place.

The X Composite extension opened up a wealth of possibilities for enhancing the free software desktop, however it came with a cost in performance and power -- extra memory used by applications and extra copies of that memory from application buffers to the screen. This presentation will describe and demonstrate enhancements to the Present extension which can eliminate most of these additional copies, and with suitable kernel and application changes, eliminate even more copies for non full-screen double buffered applications.