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Slow internet or network card throughput might depend upon several factors. First of all:
- What version of Windows is on your Lenovo B575, and how much RAM memory does it have?
(Too little RAM could slow the whole machine down, making it grind-grind-grind away, and perhaps / probably also slowing down the machine in general and the network throughput.)
- Is the network card a 100 Mbps card, or is it a 10 Mbps card? (I don't think this is the problem. It wouldn't run faster than 10 Mbps if it were the latter.)
- Is the laptop's network port connected directly to the modem for the Fiber Optic internet? (If it goes through any other device, that might be slowing it down.)