Large Scripts Run too Slowly

[Ray]

I've got a stack script of over 15,000 lines.  It's recently started 
running too slow to work with.  Everything is painfully slow from plain 
typing to searches to scrolling.  Stepping through lines with the 
debugger is almost impossible.

I start using this stack at launch so all other stacks in the project 
have access to the handlers.

Does anybody have any suggestions regarding splitting it up or something?