Forums mIRC Help Script DCC send vs. manual DCC send

Someone I trade files with has his manual DCC sends go much faster than his script-served DCC sends. Not sure about everybody else I know.

Sends have worked this way for his whole serving career. Assuming this isn't an issue with his Omenserve settings (the script he is using) is there any reason this is caused by mIRC? Perhaps it's an issue with the way the Omenserve script interfaces with mIRC?