Spell Check becomes non-responsive when checking large document.

InDesign's spell check becomes non-responsive when checking a large (1,200 pages) document. When initiating the spell check the application becomes non-responsive for upwards to 30 minutes. Sometimes, it seems (maybe coincidence) that opening the MacOS Force Quit dialogue box causes ID to suddenly snap out of it. Once it decides to actually start checking words there seems to be no further issue.

Anyway, it's imperative that I run the spell check before this document goes to print. I know there's the argument that ID is not meant for editing. Editing is not the point. If you've ever maintained a large document you know how it can make you sleepy and prone to inadvertent keyboard taps, which can turn up as misspellings. I have to do this 2-3 times a year and I dread it every time.

Seems to me, from a purely programmatic standpoint, that spell check should take place in a non-graphical space that should not be a CPU-intensive task. Does anyone else have this issue?