To increase internet speed manually :-
Follow the below steps:-
★ Start > Run and type gpedit.msc and hit the OK button.
★ Then expand Administrative templates >> Network>> QoS packet scheduler.
★ Then click on the limit reservable bandwidth. And it'll opens a new window.
★ In that new window select disable and then click OK.
★ After that restart your computer.
Yes you just done.
Now your internet speed will be little bit more than before.