Slow upload speed

[Manhatten]

Hello!

Just got my new iMac i5 and I'm having trouble getting the right upload speed. Download speeds are OK.

I have 10/10 mbps lines. I also have a pc, wich the upload speed is fine.

I can not get faster upload than 6mbps. Same result using cable and WiFi.

I have not touched the default network settings, expet trying various MTU settings, but that did not help.

Any suggestions?

 

[Manhatten]

To rule out any hardware issues I have now installed Boot Camp and Windows 7.

In Win 7 I get over 10mbps, and OS X barely 6mbps.

This drives me nuts!

Any suggestions will be highle appreciated?