I have noticed that after re-installing win 7, my download speed stays around 12000 to 15000 kbs (bitmeter) for 2 to 3 hours, it then goes down to around 300kbs to 600kbs and stays there for most of the time sometimes getting to 1200kbs.

Does anybody know why this happens and is there any file i can delete to get max speed back, even for a few hours

reinstall your computer again ?

google ISP Traffic shaping

google ISP Traffic shaping

Cheers, i found the following and it explains it pretty good,

now i need to know how to delete my empty bucket and have it replaced with a full one without re-installing windows

Emptying the bucket

Traffic shaping hardware generally relies on the concept of a “token bucket.” Traffic management hardware will generate a digital token for each Internet user at a predetermined rate. These tokens fill a virtual token bucket; transmitting packets over the Internet removes tokens from the bucket. If the bucket empties, no more data can be transmitted until a new token is deposited.

The practical result is that the user sits down to her computer with a full token bucket and can immediately blast data through her connection as fast as the connection can go. But after some interval of time, usually measured in seconds, this sort of full-throttle data transmission empties the token bucket and the user is now limited to transmitting at the token generation rate.

ShaperProbe measures the length of time it takes for traffic shaping hardware to make a "level shift" to a slower speed limit on the line. Charting this data enough times, and from enough different users with different Internet access tiers, allowed Kanuparthy and Dovrolis to estimate the token bucket parameters—and thus to figure out exactly when and how traffic shaping kicks in for any particular ISP's speed tier.

Traffic shaping isn't necessarily some devious attempt to give users less bandwidth than expected; it can also be used to let users transmit "bursty" files more quickly than their speed tier would otherwise allow, shaping them down to their chosen tier only after some set amount of time. This is how Comcast markets its "PowerBoost" technology, for instance.

simple never use torrents, use MAGNET links instead .. really helps..