I can't make this movement in one level between two rooms?!

whoops, sorry, you can. IIRC the lag is due to the order of frame execution. In A4 times there was a hint in the manual that you should insert a wait(1); before setting the new coordinates.

So all I need to do is just add new vector to player with wait(1); before adding it?
I can just place player at the new vector too, but will that be smooth? I don't think so...
Something about portals:
Gravity with portals
Light throw portals
Some portals
Portal self collusion
This portals made with Newton, but I can't really believe that they create the second copy for a model in second portal...
I don't know, I just can't... For me it's just a hole in that leads to another hole...

If you record the player's velocity as you do it, yes. There will be a level_load in between that will cause a slow down, though.

Yeah, but I don't need that slow down thing. Thats why I think about having all rooms (or most of them) in one level.

Why dont you just switch rooms off that cannot be seen? What about the zones feature in A8?

Thats exactly how I'm going to put all rooms together in one level, the only problem I'm still facing is smooth movement from one room into other through door... About zone features, I think it's only available for PRO version, or am I wrong?

Anyone?