Jukka Marin wrote:

> Try this (as root):
> 
> sysctl -w vm.filemin=0 vm.filemax=1

Thanks for the suggestion. I tried it, but I don't think it made a big 
difference. I tried unpacking pkgsrc, but the mouse cursor was still 
jumpy, with 5-6 second continuous pause when it was't updated at all.