PHP fatal memory exhaustion errors after moving to in-house hosting
Moving a website to an in-house server can trigger recurring fatal memory exhaustion errors, often occurring around the same time every day when users attempt to log into the admin dashboard. This issue blocks normal site management and administration tasks, forcing administrators to constantly troubleshoot server logs and resource limits.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1rolling back PHP versionDid this help you?
- 2turning off JITDid this help you?
- 3bumping memory limits in wp-config.phpDid this help you?
- 4turning off all plugins and turning them back on one at a timeDid this help you?
- 5Making the template smallerDid this help you?
- 6Reducing the size resolution of the imagesDid this help you?
- 7Storing files as content document links or using custom merge fields referenced by IDs to reduce heap loadDid this help you?
- 8Writing extensive notes on sticky notes and in plannersDid this help you?
- 9Asking trusted colleagues to look over work and provide remindersDid this help you?
- 10Increasing vitamin D and B complex intakeDid this help you?
- 11Blaming mistakes on caffeine not working yetDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I just realized right now that my postpartum mom brain failed me at work this week.”source ↗
“Thing is, I know it’s not an excuse but I am struggling bad with my memory at work.”source ↗
“I’m just over 4mo postpartum & breastfeeding too. And no but I could ask when I see my OBGYN!”source ↗
“I'm just a little over 2 years now and still breastfeeding, so some of the mom brain is still lingering”source ↗
“I currently have sticky notes all over my desk and notes in the margins of my planner so I remember everything!”source ↗
“Thanks a lot u/DaveTheNGVet . We are already testing your tool and so far good, but we are hitting one snag - we have word template with some images, altogether 10mb and we hit Apex heap size too large. Any suggestions how we can go around it (other than making the template smaller)?”source ↗
“ever since moving to inhouse hosting on our own server we have been having this error pop up: [16-Sep-2026 14:23:20 UTC] PHP Fatal error: Allowed memory size of 4294967296 bytes exhausted (tried to allocate 4295229440 bytes) inwebsite\wp-includes\theme.php on line 189”source ↗
“I'm racking my brain between shoving error logs into copilot and trying to check databases and other logs as to why this happens around the same time everyday when someone tries to log into the admin dashboard.”source ↗
“My phone storage has a different opinion lmao”source ↗
Where this came up
People with this problem also raised
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