The thing is you're not going to see much performance boost on most downloads. Unless the server you are downloading from is on like a Tier 1 ISP or has some awesome way of load balancing, you pretty much max out at 2.x MB/s.
It would matter more if you are hosting some sort of server that needs the upload throughput or you are a client consuming a ridiculous amount of bandwidth from different servers at a time.
I don't personally notice a difference from 15 at home to 30 at work.
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