X responsiveness under high load

[Boris Lenko <boris_lenko_(_at_)_yahoo_(_dot_)_com>]

Why does X, specially the mouse, become extremely
sluggish under high load on OpenBSD? For example,
trying this on FreeBSD and Linux doesn't seem to
affect mouse movement:

$ cat /dev/urandom > /dev/null

But on OpenBSD, I can barely move the mouse. I have
tried renicing X which doesn't help. Does anybody have
any suggestions for improving responsiveness?

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