Hi @DawidS
The AJAX call is due to the taxonomy field effecting which field groups to show / hide.
The taxonomy field contains an option to ‘save / load’ to database. If this option is NOT selected, the AJAX should not fire.
If the AJAX is firing, you are experiencing a current bug which is now FIXED in the latest ACF on github. Perhaps you could download and test it out?
Thanks
E
