what's the sector limit?

When I tried to open my SLIGE-generated monster level in doombuilder 1.68, it just froze on me. The final doom engine plays it after a long wait, but doombuilder doesn't want to know. It has 8,734 sectors and 8,108 things. What's doombuilder s limit for maps?

Don't know of any sector limits in Doom Builder. If you can get the DOS or Doom95 engine to run your map it's more likely a case of DB 1.68 being unable to reconcile the errors, which you can expect to find plenty of in a large SLIGE map.

Maybe because there are so many things & sectors, it causes your game to lag so badly that it froze. It reminds me of one decorate item I made, I put that health item in the map and it froze completely.

You probably made a zero-length infinite loop somewhere. Something like this:

Actor blah : blah
{
   Blah properties blah
   States
   {
   Spawn:
      BLAH A 0
      Loop
   }
}

You make a zero-length infinite loop. The engine will never stop changing this actor's state to the next in the same tic, so it never gets to process the rest of the actors. The game effectively freezes.

...As GreyGhost makes a concise answer, WTG and Gez arrive to take a huge dump.

SLIGE? That old rusty RMG? Try Oblige

And yes, I am sure DB should handle a generated map of that size.