Interestingly, I checked my registry and found that the change to 30 seconds had already been made!

Then I remembered that, using Firefox as my browser, I had installed a helper app named, ingeniously, Tweak Network Settings. Ran it once after installation, selected "Max Everything". (Well, of course!) And never thought about it again. Seems to have made that adjustment, among others.

Will be interested at Lijun's response - also cc'd Graeme (Dr. Henkelman) who is the overall project admin and who wrote the original code, btw. He it was who brought EON from its birthplace in UWashington to UTexas.