[YellovvYoshi]

No idea but you could try writing the file out with the annotations embedded,
Then import this new file and see if it suffers from the same lag issues.
If it does still lag, then that would indicate that the annotations are not the problem.

Geoff

Thanks Geoff!

I did think about this, but unfortunately, as I mentioned in the original post, I can't afford to flatten the annotations because there will very likely be changes to those during the rehearsal period, and I need to be able to erase them and change them on the spot...