Hi @LetterAfterZ
It is possible that ACF PRO is using more memory than the previous free version, however, I am running my local version on the default 32mb with lots of custom code and plugins.
It may be possible that other plugins / theme code is using up lots of memory, and ACF is the final straw before you hit the limit.
Are you able to remove some other functionality? Perhaps also contact your host to see if some php setting can be tweaked to improve the performance?
