Thanks James,
That’s what I tried, but it didn’t seem to want to generate the .json files when I saved the ACF groups. I’ll give it another [proper] try and see how I get on (I came to ACF forums to make sure I wasn’t chasing a dead end).
My work’s developed our own developer suite and it includes DB query counts, so I’ve been using that to see if there’s any difference; there doesn’t seem to be.
Yep, caching’s my next route now, just thought I’d dig into the code and see if I could alleviate some of the load!