Hello, welcome to SG and thank you for the positive feedback, glad the Optimizer worked that well for you. Not sure exactly which setting fixed it for you, could've been the default congestion provider, some buffer, etc.
All the settings that it changes are documented on the site, and the program also lists them when you hit "apply".. We also have a lot of tweaking articles on the main site, the TCP Optimizer just does all the main tweaks in a simple/quick form.
TCP Optimizer Documentation with all the settings: https://www.speedguide.net/articles/...8-10-2012-5821
Tweaking Articles: https://www.speedguide.net/articles.php?category=93
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