I don’t have any benchmarking on testing with and without ACF JSON sync but it’d be very interesting to see the difference..
If/when this is fixed and you do make a switch it’d be very nice if you post your results for us to see 🙂
Another way to go about this for you (if you’re in pressing need) might be to:
* Update to ACF 5
* Create the acf-json folder in the theme
* Import all the fields into field group admin
* Delete the php fields
* Use the JSON files for your version control etc. instead of continuing on php. Alternatively continue using PHP too but for live -pushes make sure to import them into field group admin first and skip pushing/uploading the php files to Prod.
