About the performance issue :
I founded this comment : https://bugs.launchpad.net/ubuntu/+source/linux/+bug/430694/comments/52
It explains why it's slow with KMS on my computer (video : Intel 845G). KMS is incompatible with XVideo on this GPU (but KMS works normally with XVideo with Intel GMA945 on my laptop). I create bug #460399 about this issue.
About the performance issue : /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/430694/ comments/ 52
I founded this comment : https:/
It explains why it's slow with KMS on my computer (video : Intel 845G). KMS is incompatible with XVideo on this GPU (but KMS works normally with XVideo with Intel GMA945 on my laptop). I create bug #460399 about this issue.