You can turn off the master DRC switch and disable dynamic shapes (Display -> Status). When you are finished constructing the board, turn on dynamic shapes, update them and then do a drc update. If adding constraints to a board, it is much faster to load them via a techfile instead of using Allegro scripts to load individually via constraint manager (e.g. avoid "cmgr" commands in your script)
You should also look at your script and remove any "zoom" and "roam" commands. Leave any "trapsize" commands since they are required.