* Large files may grow sluggish in other ways. I've noticed in 100KB files
  that closing the window can take a few seconds. And it seems to take longer
  in proportion to how far down my edits are. The phenomenon persists even if
  I take out undo history.

* Large files may grow sluggish in other ways. Pasting more than a line or two
  gets slow. I've noticed in 100KB files that closing the window can take a
  few seconds. And it seems to take longer in proportion to how far down my
  edits are. The phenomenon persists even if I take out undo history.