Get help and discuss anything related to tweaking your internet connection, as well as the different tools and registry patches on the site. TCP Optimizer settings and Analyzer results should be posted here.
DefaultTTL is a Windows Registry value that specifies the default Time To Live set in the header of outgoing IP packets. TTL determines the maximum amount of time an IP packet can live in the network without reaching its destination. It is effectively a limit on the number of routers an IP packet may pass through before being discarded.
It really has no effect on speed, for broadband a good value is 64 and for dialup 128 is good.
Did you read the definition? A lower value is fine for a high speed connection because an IP packet will reach it's destination faster, a higher value is better for a slower connection because of the opposite.