Once you get over 100 Mbps it really depends on your equipment. To get faster speeds you need Gigabit Ethernet, or decent 802.11ac Wi-Fi devices. That includes the modem/router/gateway, it's LAN ports speed, it's Wi-Fi capabilities, and your client device network/Wi-Fi adapter capabilities. Also, keep in mind most residential ISPs quote speeds of "up to" so many Megabits (not Megabytes, that's ~1/10th of the Megabit speed).
Another thing to consider is you'd get different speed to different servers. Your ISP is usually the fastest, and the further you get from them the slower it gets, as it depends on their backbones' congestion at the moment, their peering arrangements with other companies, the end server's ability to serve you certain speed at this particular time, etc.
Considering all that, you may still be able to improve the line using the TCP Optimizer, just apply the "optimal" settings.
If you are unhappy with the speeds you are getting, and they are constantly slower than 50% of what your ISP advertises, you may want to contact them and complain about it as well.
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