# Significant performance drop in high-computation tasks after update 36.20 **URL:** \ **Category:** Issues and Bug Reporting\ **Tags:** Reso-WontFix, Status-Closed, unreal-editor-for-fortnite, fortnite-creative, fortnite\ **Created:** [September 5, 2025, 3:21pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997 "2025-09-05T15:21:29Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![FNC\_Julianxd](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/fnc_julianxd/32/1030829_2.png) [@FNC\_Julianxd](https://forums.unrealengine.com/u/FNC_Julianxd)\ **Post date:** [September 5, 2025, 3:21pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/1 "2025-09-05T15:21:30Z")
### Summary Since update 36.20, my fluid simulation Verse code shows a drastic TPS regression. Previously, the same setup ran consistently at ~23 TPS, but now it only reaches ~6 TPS, reflecting about a 70% performance loss. This drop appears related to the additional transactional memory overhead introduced by AutoRTFM ### Please select what you are reporting on: Verse ### What Type of Bug are you experiencing? Verse ### Steps to Reproduce 1. Create a Verse script with higher computation tasks (like a fluid simulation in my example). 2. Run the setup. 3. Observe the TPS values during execution. Note: Based on old recordings from July 11, 2025 (before v36.20), the same fluid simulation ran at ~23 TPS. After the update, the identical code now runs at only ~6 TPS. (Video below) ### Expected Result TPS should remain stable and consistent, similar to the pre-36.20 behavior ### Observed Result After 36.20 update, TPS dropped massively from ~23 to ~6 TPS on the same code. This is roughly a 70% performance loss. ### Platform(s) pc ### Video [![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/d/1/1d163774b74fd92d25caf7c14811922ecca70773.jpeg "Fluid Simulation (before and after v36.20)") ](https://www.youtube.com/watch?v=5hOymJvmsHs) ### Additional Notes I suspect the performance loss is caused by the overhead introduced by AutoRTFM (Verse’s transactional memory system). According to Epic’s tech blog ([https://www.unrealengine.com/en-US/tech-blog/bringing-verse-transactional-memory-semantics-to-c](https://www.unrealengine.com/en-US/tech-blog/bringing-verse-transactional-memory-semantics-to-c)), every write inside a transaction must be logged so it can be rolled back later, and in internal benchmarks they’ve seen code run up to 4× slower. Since this overhead now also applies in async contexts in order to eventually remove the no\_rollback effect, it results in massive TPS drops during high-computation tasks like fluid simulations. ---
**Author:** ![TheBoyDill](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/theboydill/32/916700_2.png) [@TheBoyDill](https://forums.unrealengine.com/u/TheBoyDill)\ **Post date:** [September 5, 2025, 6:21pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/3 "2025-09-05T18:21:13Z")
I want to add to this report that we ran into computation issues in 2 projects we’re working on and that’s how we came to investigating this more. The fluid simulation example is just a really clear way to show the degradation before and after the update. We also believe this has contributed significantly to detrimental increase in server lag and degradation in our game Cash Tycoon (1890-7083-7904). This restriction has severely handicapped our workflow and ability to produce complex verse systems. ---
**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:** [September 5, 2025, 7:13pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/4 "2025-09-05T19:13:40Z")
I had a similar thing and reported it here > [@Has something changed with the verse engine causing performance issues ?](https://forums.unrealengine.com/t/has-something-changed-with-the-verse-engine-causing-performance-issues/2614774): > > Summary I published a map recently a cube io game and everything was fine all the way through testing ect i managed to get the map play tested and this also visually looks good yet now for some reason even with 2 players and very small chain lengths its so bad on performance and i dnt get the issue ? Its like after the last update something has drastically changed with the verse engine and it doesnt run as efficient as it did previously Please select what you are reporting on: Verse What Type … Didn’t even get acknowledged Broke the game and its unplayable and all I’m using is MoveTo() ---
**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:** [September 5, 2025, 7:37pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/5 "2025-09-05T19:37:42Z")
We’ll get someone to take a look. ---
**Author:** ![NoahUEFN](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/noahuefn/32/728056_2.png) [@NoahUEFN](https://forums.unrealengine.com/u/NoahUEFN)\ **Post date:** [September 5, 2025, 8:02pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/6 "2025-09-05T20:02:02Z")
It’s so interesting. Almost every single map now has small lag spikes that affect ping after the new season update. Before you could easily e.g. Teleport 20 players+ in the same tick without any ping or tps issues. Now if you do that you get a 200+ ping for a few seconds + the yellow connection marker. ---
**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:** [September 5, 2025, 8:11pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/7 "2025-09-05T20:11:10Z")
Yes something did drastically change my game went from 25tps under strain to 2-3tps and sometimes complete stop ---
**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:** [September 8, 2025, 7:28pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/9 "2025-09-08T19:28:38Z")
This is a regression though ? ---
**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:** [October 7, 2025, 11:52am UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/10 "2025-10-07T11:52:04Z")
Bumping this as my game is still broken due to this issue. ---
**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\ **Post date:** [March 4, 2026, 3:22pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/11 "2026-03-04T15:22:15Z")
This topic was automatically closed after 180 days. New replies are no longer allowed. ---
**Author:** ![Bug-Reporter](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bug-reporter/32/997076_2.png) [@Bug-Reporter](https://forums.unrealengine.com/u/Bug-Reporter)\ **Post date:** [November 10, 2026, 7:00pm UTC](https://forums.unrealengine.com/t/significant-performance-drop-in-high-computation-tasks-after-update-36-20/2653997/12 "2026-11-10T19:00:22Z")
FORT-968021 has been ‘Closed’. This issue won’t be fixed—please see examples of why this may be the case.