This seems to suggest GCSuspend() and GCResume() don't cause memory leaks.
Let it run for a few seconds, then press Space.
Strict
Graphics 800,600
GCSuspend()
While Not KeyDown(key_escape)
Cls
DrawText GCMemAlloced(),10,10
Flip
If KeyHit(key_space)
GCResume()
EndIf
Wend
End