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Amount of memory a php process can use. IIRC it kicks off a process for each user so if you have a php process that uses a large amount of memory it won't take too many users being wowed by your video prowess before you hit the limits of the service that's hosting the site and things grind to a halt.
Yeah you should fix it.
Howard
@CYOA
What is php memory?
Had an internal server 500 error on a wordpress site I'm building.
Quick google suggested adding memory=64MB to php.ini which I did and which solved it but I'd like to know what exactly it is and why 64mb seems adequate. Am I likely to need to increase that in the future? Is there something I've done with my site which isn't efficient and should be remedied before I start sharing the link in case the user experience suffers?
Plugins used:
contact form 7
smash balloon insta/twitter feed
slider revolution (which I suspect may be the issue as that was what I was working on before it toppled)