5.4-prerelease - hanging under load

[Pierre-Luc Drouin]

Since I upgraded from 5.3-stable to 5.4-prerelease, I've noticed that my 
computer is hanging badly under load. I've a P4 2.53 GHz without 
hyperthreading (no SMP). I use the same kernel configurations than 
before. Now when I compile a port for example, the mouse pointer hangs 
in Fluxbox and Mozilla takes forever (meaning ~5 sec) to refresh the 
screen. Even vi hangs. I do not see any warning/error message. Is it a 
known problem with 5.4?

Thanks

Pierre-Luc Drouin