Why does my mac slow down my download speed?

Hello,
I just bought my macbook pro(retina) and downloaded mozilla firefox ,but it shows that the download speed is 40 KB/s (it should be 140-160 KB/s) any1 can help me?

Yes, i know that but when i download the same thing from the exact same server from my PC the DL speed is 140-160 KB/s (the speed it should be.

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