I also suffer from this bug. It persists into 2.6.15-26. Not only does 'noapic' make the mouse sluggish, it misses keys if I type at full speed. This is unusably bad.
This might be related to Bug #54621. -- Kernel panic - not syncing: IO-APIC + timer doesn't work! https://launchpad.net/bugs/52553 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
