@Alex8888: Just read the manual and you see that there is of course nothing like this mentioned. But strange ideas sometimes come up, some users think that the engine is sort of "exhausted" after a huge command and needs a wait() to "recover"!

But please don't give such advices to newbies. Better read the manual and tutorial about how to load a level, there are examples just in the very first lesson, and of course without "wait"!