03-14-2011, 06:16 PM
Same thing has been happening with my 2.66 GhHz Quad-Core Xeon on the internet. A restart, about every day, keeps the speeds up. Three other Macs on the wireless LAN are unaffected. When it slows, to about 1 Mbs download speed (from about 10 Mbs), both Safari and Firefox are affected. Onyx did not help nor did DiskWarrior nor repairing permissions.