I am on an aluminum iMac, running 10.5.8. I use Comcast as my ISP and use a Linksys WRT160N router. Now the problem. A few days ago while doing an insternet speed check, I noticed my upload speed was nowhere near what it used to be. I currently have around 2000kbps when I originally had around 8000-10000kbps. My download is unaffected. Any ideas?