If you are playing on the latest version of the game or a popular private server, you likely don't need an external .exe file anymore. Here is how you achieve a delay-free experience now:
W3DR is a lightweight third-party application that modifies the network latency settings of a hosted Warcraft 3 game. By default, Warcraft 3 has a built-in latency of roughly 100ms to 250ms to ensure stability over slow internet connections from the early 2000s. warcraft 3 delay reducer 24 2 free download link