Hello Mark.
"TCP options string" is simply part of TCP packet headers. It is deciphered below in the same paragraph in the Analyzer results. Some of the bits advertise the size of the MSS, the size of the TCP Window, RWIN scaling, TTL, timestamps, SACK, etc. It is not useful without being deciphered, the Analyzer already does that for you though. There is nothing you should be doing with it.
The easiest way to optimize your connection is to simply use the "TCP Optimizer" program (from the downloads section), set it to your advertised internet speed, tick the "optimal" settings and apply the changes. It will cover all the basic tweaks for you.
I hope this helps.
Best,
Philip
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