There are a few info you need to find out before you can tweak:
What are your ISP advertised speeds?
What is your comp's present settings with regards to MTU, RWIN and latency?
Is your comp free of viruses, spyware and malware?
To answer the 2nd question, do this test and post:
https://www.speedguide.net/analyzer.php
To answer the 3rd question, you need to scan and make sure you are clear.