# UEFN Memory Leak **URL:** \ **Category:** Issues and Bug Reporting\ **Tags:** fortnite-creative, unreal-editor-for-fortnite, fortnite\ **Created:** [February 25, 2025, 9:45am UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972 "2025-02-25T09:45:09Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![chrisp\_games](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/chrisp_games/32/895155_2.png) [@chrisp\_games](https://forums.unrealengine.com/u/chrisp_games)\ **Post date:** [February 25, 2025, 9:45am UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/1 "2025-02-25T09:45:09Z")
### Summary Since the last UEFN update, it seems there is a memory leak somewhere in UEFN I can not pinpoint where it is coming from but after a quick search on Twitter/X I found that multiple people seem to have had the same problem since 34.00 so it is not a problem on my end My PC is pretty powerful with 32 gigs of RAM and an RTX 4080 but I already got multiple crashes with out of memory. In this post from Wertandrew on X a lot of people already have the same problems: [https://x.com/Wertandrew/status/1893651882448441357](https://x.com/Wertandrew/status/1893651882448441357) ### Please select what you are reporting on: Unreal Editor for Fortnite ### What Type of Bug are you experiencing? Stability ### Steps to Reproduce It just happens when working with the editor for a while ### Expected Result Editor does not crash or use up extremely big amounts of memory ### Observed Result Editor uses alot of RAM or crashes with out of Memory ### Platform(s) windows ### Island Code 2834-9322-3016 ---
**Author:** ![NotRekss](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/notrekss/32/755044_2.png) [@NotRekss](https://forums.unrealengine.com/u/NotRekss)\ **Post date:** [February 25, 2025, 10:01am UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/2 "2025-02-25T10:01:47Z")
This has been happening since around Dec 26th 2024, or atleast I’ve been experiencing it since then, to remedy it I’ve had to close quite literally every software on my computer except UEFN and Fortnite along with keep it unlit and on the lowest settings possible. Even then it crashes with out of memory errors. Furthermore, on big projects it can straight up BSOD a pc, I’ve since then upgraded my RAM, and CPU and it still worries me whenever opening projects due to how rampant the issue is, I believe the issue is with the tools in place to restrict content and devices they don’t want us to access freely as this is not an issue with UE5 ---
**Author:** ![Wertandrew](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/wertandrew/32/916192_2.png) [@Wertandrew](https://forums.unrealengine.com/u/Wertandrew)\ **Post date:** [February 25, 2025, 10:32am UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/4 "2025-02-25T10:32:19Z")
I think whats happening for me is that another software was causing the memory leak, and UEFN crashed because of it. I am investigating atm, but I think its not UEFN. The screenshot I posted had Spatial Profiler open, which I later realized may be the one grabbing all the RAM. Still investigating though ---
**Author:** ![AllyJax](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/allyjax/32/1217680_2.png) [@AllyJax](https://forums.unrealengine.com/u/AllyJax)\ **Post date:** [February 25, 2025, 10:32am UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/5 "2025-02-25T10:32:45Z")
Can confirm I’ve seen a sharp uptick in out of memory crashes amongst both me and my friends, I have 64gb of ram and a 3080ti, and still am experiencing out of memory crashes. Since some time in December I have also seen an uptick in complaints regarding large amounts of memory being used, though due to my previously mentioned 64gb of memory it never caused out of memory for me or any real issues myself, this patch however is using such an astronomical amount of memory that it is somehow managing to still run out and crash. ---
**Author:** ![AtAshTag](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/atashtag/32/997253_2.png) [@AtAshTag](https://forums.unrealengine.com/u/AtAshTag)\ **Post date:** [February 25, 2025, 12:55pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/6 "2025-02-25T12:55:24Z")
Just to add for further info if its helpful By memory i mean PC Ram which i have 4 sticks 32gb 5200 hz I had 64gb and the back end of last yr i also seen some increase in memory for both UEFN and Fortnite combined. It went to about 29gb ram used which is the highest ive noted and when i had 64gb with all the other apps/system itself it got abit much so i upgraded and now have 128gb and no issues although i still have the odd crash and mainly when i open UEFN and Fortnite and leave them and go do something for a hour and when i come back the crash has happened and shows the out of video memory. I have a 4060ti 16gb and it never struggles tbh so idk what that error is but yea thats my experience with it ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/2/c/c2c204dae3d6019f92b9feca92d4dc096997d37f.png) I will also add when you open a huge project i think the ram is even more this is a basic project new tbh few days old ---
**Author:** ![Hardcawcanary](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/hardcawcanary/32/906569_2.png) [@Hardcawcanary](https://forums.unrealengine.com/u/Hardcawcanary)\ **Post date:** [February 25, 2025, 2:45pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/7 "2025-02-25T14:45:31Z")
The out of memory can sometimes refer to the Virtual Memory, Increase your Paging file size. I noticed a lot of improvement in many areas when changing from Windows default setting somewhere under 30Gb to 211GB on a seperate dedicated SSD ---
**Author:** ![AtAshTag](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/atashtag/32/997253_2.png) [@AtAshTag](https://forums.unrealengine.com/u/AtAshTag)\ **Post date:** [February 25, 2025, 2:46pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/8 "2025-02-25T14:46:24Z")
What is this and how do i do that ? I have numerous ssd’s so can sacrifice 500gb ---
**Author:** ![Hardcawcanary](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/hardcawcanary/32/906569_2.png) [@Hardcawcanary](https://forums.unrealengine.com/u/Hardcawcanary)\ **Post date:** [February 25, 2025, 2:54pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/9 "2025-02-25T14:54:03Z")
On Windows 10, type advanced system settings in task bar click on performance settings then click on the advanced tab and you’ll see Virtual Memory click on Change Now you can select all your spare SSD’s or just the one and set a custom size Remove the paging file from the drive/s that holds Windows and UEFN/Fortnite, should speed them up too You’ll have to Restart PC The virtual memory is just an extension of RAM, windows and other programs use it as extra ram for lower priority memory storage Windows by default sets the hard drive to use about 11% of hard drive size, so a full disk will slow up a PC because it reduces the size of the paging file ---
**Author:** ![AtAshTag](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/atashtag/32/997253_2.png) [@AtAshTag](https://forums.unrealengine.com/u/AtAshTag)\ **Post date:** [February 25, 2025, 2:55pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/10 "2025-02-25T14:55:03Z")
Is it same on Windows 11 ? ---
**Author:** ![Hardcawcanary](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/hardcawcanary/32/906569_2.png) [@Hardcawcanary](https://forums.unrealengine.com/u/Hardcawcanary)\ **Post date:** [February 25, 2025, 2:58pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/11 "2025-02-25T14:58:45Z")
Should be close may have to google it changing paging file size windows 11 ---
**Author:** ![AtAshTag](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/atashtag/32/997253_2.png) [@AtAshTag](https://forums.unrealengine.com/u/AtAshTag)\ **Post date:** [February 25, 2025, 2:59pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/12 "2025-02-25T14:59:53Z")
kk ill try that ty dude ---
**Author:** ![chrisp\_games](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/chrisp_games/32/895155_2.png) [@chrisp\_games](https://forums.unrealengine.com/u/chrisp_games)\ **Post date:** [February 25, 2025, 5:48pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/13 "2025-02-25T17:48:03Z")
Interesting, gonna look into that. Maybe it is the spatial profiler for me as well as I started using it more lately. ---
**Author:** ![chrisp\_games](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/chrisp_games/32/895155_2.png) [@chrisp\_games](https://forums.unrealengine.com/u/chrisp_games)\ **Post date:** [February 25, 2025, 5:49pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/14 "2025-02-25T17:49:25Z")
leaving UEFN open for a while and then coming back also often led to a out of memory crash to me and is the thing that happens the most for me also ---
**Author:** ![Vilvalas](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/vilvalas/32/993743_2.png) [@Vilvalas](https://forums.unrealengine.com/u/Vilvalas)\ **Post date:** [February 27, 2025, 9:37am UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/15 "2025-02-27T09:37:57Z")
I think this is not related to the latest update, since I already had issues with 32 GB RAM earlier. ---
**Author:** ![AtAshTag](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/atashtag/32/997253_2.png) [@AtAshTag](https://forums.unrealengine.com/u/AtAshTag)\ **Post date:** [February 27, 2025, 9:59am UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/16 "2025-02-27T09:59:48Z")
Just to add for future people i found these 2 vids for paging file on windows 11 Change the size: [![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/a/c/fac360543545fe1b133c03ee40a90b2055e81db8.jpeg "How To Optimize Performance Using Virtual Memory in Windows 11") ](https://www.youtube.com/watch?v=q_I6WLXK1gE) Change the location if using another drive: [![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/2/b/32b885c8df369fb8ad8fc18136c7b13821183cd1.jpeg "FREE Up Space on Your Computer by Moving Your PAGEFILE to Another Drive!") ](https://www.youtube.com/watch?v=nA4hTUAJMME) ---
**Author:** ![AtAshTag](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/atashtag/32/997253_2.png) [@AtAshTag](https://forums.unrealengine.com/u/AtAshTag)\ **Post date:** [February 27, 2025, 10:00am UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/17 "2025-02-27T10:00:53Z")
TY for the help I found some vids Mine was set to 8gb originally even tho i had 128gb ram Windows is so strange ---
**Author:** ![Hardcawcanary](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/hardcawcanary/32/906569_2.png) [@Hardcawcanary](https://forums.unrealengine.com/u/Hardcawcanary)\ **Post date:** [February 27, 2025, 11:54am UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/18 "2025-02-27T11:54:29Z")
Wow 8gb is tiny, well not really I guess, but for what we use it for it is Maybe because you had 128gb ram, windows thought it was big enough to run everything, so you didn’t need a large paging file. But for programs like UEFN that use it, those windows default settings give such a nice PC a very narrow bottleneck. ---
**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\ **Post date:** [March 3, 2025, 6:50pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/19 "2025-03-03T18:50:36Z")
> [@AtAshTag](#): > > What is this and how do i do that ? I have numerous ssd’s so can sacrifice 500gb hi @AtAshTag @Hardcawcanary , Recently with 34.00 Feature Examples [TMNT City Sample Error](https://forums.unrealengine.com/t/tmnt-city-sample-broken/2364762) Adding a 64 GB page file for Virtual Memory fixed the problem. see this post You may need to add a 64GB pagefile.sys, which I documented in [Install a bigger pagefile.sys](https://forums.unrealengine.com/t/cant-create-c-project-or-use-c/238169/2) You can use any SSD drive to full size and its better if the pagefile is on a dedicated drive. My laptop needs 32GB as it’s a home laptop with 8GB, so my 32GB pagefile just about does the job and its a lot cheaper than a top spec laptop, being an indie. UEFN and Fortnite used to run at 18GB in 30.00 UE5.5 and now we have UE5.6, generally its over 20GB ![IK RetargeterPagingFileSize](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/9/1/39106675b72baa3ddafce5269cb0b317d53734f3.png) More recently a bigger pagefile fixed this problem [IK Retargeter Causing UEFN To Crash - General / Issues and Bug Reporting - Epic Developer Community Forums](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/8) Whenever MS Edge, based on Google Chrome, is running for the editing of posts, then the memory, basically takes 10.8 GB for 8 windows Epic Community posts to take this up. ---
**Author:** ![AtAshTag](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/atashtag/32/997253_2.png) [@AtAshTag](https://forums.unrealengine.com/u/AtAshTag)\ **Post date:** [March 3, 2025, 6:54pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/20 "2025-03-03T18:54:37Z")
I found a few vids as posted above i changed it and now its this ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/6/d/a6d8ee3471087264661ee702d428c39d98c5e77a.png) Didnt seem to have issues tbh anyways but it cnt harm it to do it ---
**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\ **Post date:** [March 6, 2025, 9:52pm UTC](https://forums.unrealengine.com/t/uefn-memory-leak/2356972/21 "2025-03-06T21:52:36Z")
Hey everyone, the ticket here is a dupe of FORT-865151 - which should be fixed in the next update. [Next page](https://forums.unrealengine.com/t/uefn-memory-leak/2356972.md?page=2)