Quick question on this one are you running the speed Test through the servers network tools or a speed test of what your getting from the hub, if it is the first them your first port of call is too download the speedtest.net app and check the ping through this and then compare too your readings from the game server, it may just be a specific served issue for CS:GO.
I often have the same with COD servers but My internet is performing fine.
Anymore questions feel free to ask.
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