Get a test version of NetLimiter 4 ( http://www.netlimiter.com/nl4testing.php expires in September) and cap the upload speed of the daemon like I have...



The download speed of the blockchain will be unaffacted and still comes down as fast as it can, depending on other peers and availability.

Tick the UL Limit box for the bitmonerod.exe entry and it's capped. You can specify a different rate to cap it to by double clicking the number next to the tick box.