# UEFN freezes after doing memory calculation

**URL:** <https://forums.unrealengine.com/t/uefn-freezes-after-doing-memory-calculation/2642267>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, fortnite\
**Created:** [August 15, 2025, 12:35am UTC](https://forums.unrealengine.com/t/uefn-freezes-after-doing-memory-calculation/2642267 "2025-08-15T00:35:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Rhakys11](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Rhakys11](https://forums.unrealengine.com/u/Rhakys11)\
**Post date:** [August 15, 2025, 12:35am UTC](https://forums.unrealengine.com/t/uefn-freezes-after-doing-memory-calculation/2642267/1 "2025-08-15T00:35:48Z")

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### Summary

Since the 37.00 update, anytime I do memory calculation, UEFN completely freezes, I can’t even alt-tab back into it, and in Fortnite I can still move the camera around, but I can’t even open the menu to go back to the Fortnite lobby.  
I have to Alt+F4 out of Fortnite, and open the task manager to kill UEFN.

I am really surprised that I have not seen anyone else report this issue yet.

It happens both on my laptop (Intel CPU, RTX 3060) and my desktop (AMD CPU, RTX 3090).

I have not tried other projects, only the main project I’m working on. It’s a kinda big project, with 8000 actors in the world and almost 6000 lines of Verse code.

The memory calculation completes and the build is uploaded, the editor just dies afterwards, and takes the Fortnite client with it.

### Please select what you are reporting on:

Unreal Editor for Fortnite

### What Type of Bug are you experiencing?

Stability

### Steps to Reproduce

Launch memory calculation.  
After the process completes, UEFN is totally inaccessible and has to be killed in the task manager.

### Expected Result

Before 37.00 I could still use the editor normally after uploading a build with memory calculation.

### Observed Result

The editor is totally frozen, the fortnite client is mostly unresponsive.

### Platform(s)

Windows 11

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**Author:** ![FinestCreative](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/finestcreative/32/1034971_2.png) [@FinestCreative](https://forums.unrealengine.com/u/FinestCreative)\
**Post date:** [August 15, 2025, 12:51am UTC](https://forums.unrealengine.com/t/uefn-freezes-after-doing-memory-calculation/2642267/2 "2025-08-15T00:51:31Z")

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> [@UEFN Freezes After Memory Calculation (Today’s Update)](https://forums.unrealengine.com/t/uefn-freezes-after-memory-calculation-today-s-update/2633427/17):
>
> Can you share your logs with us finest? Instructions above!

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**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\
**Post date:** [February 11, 2026, 12:36am UTC](https://forums.unrealengine.com/t/uefn-freezes-after-doing-memory-calculation/2642267/3 "2026-02-11T00:36:14Z")

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