Hi LaRRinco,
I posted a question about this problem on the french amule forum.
this also for Lionel 77I have exactly the same pb with 10 4 8 on a ppc G4 ==> 350 Mhz !!! (used only for downloading)
Amule was running so fast with 10 4 7, that I had to change a lot of parameter to make it work perfectly, and it was really incredible ... see

Since I uploaded the 10 4 8, it works very slow, impossible to open mail or web (y're not connected on the web) ... same pathology as you
I think that amule takes to many charge on the processor with Tiger.8, because if I launch vlc on a film during 30 seconds, and close it, I can open firefox or mail, amule is still open and works (down and up) very slowly untill 0 / 0 if my session on the web is too long.
It's not a pb of amule and a ppc G4 processor even a small one (350 pci from 1999!), more a pb between amule and ppc G4 caused by 10 4 8. (calculation/sec level to high ? I don't think so)
I have a free 80gb HD and will install Tiger.7 and amule 2 1 3 on the same ppc g4 350, and will start this week end to check if splitting between the 2 different systems with same parameters in the same computer shows that Tiger.8 is conflicting with amule 2 1 3.
Using Console or Monitor doesn't show any evidence about this (supposed) overcharge.