Screenshot of EasyMTU
IPMTU MaxMTU for dial-up connections. Recommended is Small, MaxMTU = 576
DefaultRcvWindow the DefaultRcvWindow must be MaxMSS * multiplier with multiplier between 2 and 8. Recommended is four.
DefaultTTL Default Time To Live. Well, doesn’t it say it all? Default is it set to 32 Recommended is 64.
COMBoostTime The "COMBoostTime" setting affects the time (in milliseconds) the Operating System processes a COM port interrupt.
Cachesize enter cachesize here. Default is zero. Recommended is sixteen.
Slownet Use parameters for dial-up connections. Recommended is not to use it (unchecked).