DOS Program Slows !!!

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DOS program executable (GFC.exe) created in QuickBasic v4.5, runs
continuously with screen updating etc. See "Gravity Simulation" at :

http://www.petesqbsite.com/downloads/misc.shtml

When launched from a created program startup, it goes fine for about 8
seconds then slows to a "crawl".

When launched by double clicking from the Windows Explorer, it cruises
right along with no problem.

I think it must be some setting in the created startup, but what?

Help anyone please ! ....
.