I think I'm missing something here, but I can't seem to edit which units are able to be built or even their costs for that matter.
Data > Units > Probe
I can see all of the units it can build, but there's nowhere I can find to re-order them, change the costs, remove them from being built...
Just my suggestion, but there are special tools that change your map so that the file size is smaller, and it is easier to read by wc3. That should easily decrease the loading time.
Timer
Events
Time - Elapsed game time is 2.00 seconds
Conditions
Actions
Countdown Timer - Start (Last started timer) as a One-shot timer that will expire in 3600.00 seconds
Countdown Timer - Create a timer window for (Last started timer) with title Gauntlet...