sleep allows other processes on your computer to run - during the delay - kinda sharing the CPU.
The suspend commands I think are more TABOO than goto statements.... but thats a personal opinion - nothing to really concern yourself with....
You might want to do your own benchmarks on paste image versus sprite... and please report back your findings if you do!
I'd suspect Sprite is faster than paste (because paste related to bitmap subsystem I think) Yet I KNOW that a sprite goes through more "things" before its drawn than I would think a PASTE does...
In short I don't know about that one.
For spalsh stuff, I load to bitmap 1, then make it current, then when loading game done, I set bitmap 0 to current again...something like that.