Actually, I do have a thought or two. I realised that I have a lot (really, a lot) of tags which either aren’t being used by any notes or are used once or twice. It seems that all those tags are slowing Evernote down, so much so that anything I do with tags makes Evernote unusable for a few minutes or so. So, armed with this hypothesis, I decided to delete all the tags with 2 and few uses. Unfortunately the act of selecting all those tags was enough to crash Evernote and every time I opened the app after Force Quitting it on my Mac, Evernote remembered which tags I selected and tried to do that again, crashing the app all over again.
I’m backing up all 12GB of my local database and then I am going to remove Evernote from my laptop and download it all again. I should be done in March.