# Memory Calculation stuck at 0%

**URL:** <https://forums.unrealengine.com/t/memory-calculation-stuck-at-0/2602164>\
**Category:** Issues and Bug Reporting\
**Tags:** Debugging, bug, unreal-editor-for-fortnite, memory, UEFN, bug-report, fortnite\
**Created:** [July 12, 2025, 10:16pm UTC](https://forums.unrealengine.com/t/memory-calculation-stuck-at-0/2602164 "2025-07-12T22:16:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![PAKPrime](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/pakprime/32/1063291_2.png) [@PAKPrime](https://forums.unrealengine.com/u/PAKPrime)\
**Post date:** [July 12, 2025, 10:16pm UTC](https://forums.unrealengine.com/t/memory-calculation-stuck-at-0/2602164/1 "2025-07-12T22:16:49Z")

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### Summary

Hey all, I am currently having issues performing memory calculation in UEFN. It no longer performs memory calculation successfully and I cannot go to publishing my island, nor optimising memory when using results.

EDIT: solved, do all changes before session launch. Do not make changes in session before memory calculation.

### Please select what you are reporting on:

Unreal Editor for Fortnite

### What Type of Bug are you experiencing?

Memory

### Steps to Reproduce

Load my project  
Play a live session  
Run memory calculation  
Wait.

### Expected Result

Perform successfully and notify of Memory result.

### Observed Result

Looping at 0% Memory calculation, and Calculating Memory toast in UEFN endlessly.

### Platform(s)

Windows 11 PC

### Upload an image

 ![Screenshot 2025-07-12 225842.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/8/2/382829fb9bb17bfea5d25e9c15a091de7f7ca84a.png)

### Additional Notes

I had a +100k island, but managed to run calculations during the day to repeatedly optimised and obtain results, until a few hours ago where it just stopped and loops at this point.

Tried restarting UEFN, reloading my project, and kept internet connection and session stable.

EDIT: solved, do all changes before session launch. Do not make changes in session before memory calculation.

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<div class="post-metadata">

**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\
**Post date:** [January 8, 2026, 10:17pm UTC](https://forums.unrealengine.com/t/memory-calculation-stuck-at-0/2602164/2 "2026-01-08T22:17:29Z")

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