# UNREAL ENGINE 5.4 EXTREMELY BAD PERFORMANCE **URL:** \ **Category:** Rendering\ **Tags:** unreal-engine, Performance\ **Created:** [April 25, 2024, 2:56pm UTC](https://forums.unrealengine.com/t/unreal-engine-5-4-extremely-bad-performance/1821126 "2024-04-25T14:56:11Z")\ **Posts on this page:** 1\ **Showing post:** 114
**Author:** ![Uno1982](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/uno1982/32/982436_2.png) [@Uno1982](https://forums.unrealengine.com/u/Uno1982)\ **Post date:** [November 18, 2024, 11:05pm UTC](https://forums.unrealengine.com/t/unreal-engine-5-4-extremely-bad-performance/1821126/114 "2024-11-18T23:05:38Z")
> [@Sharkster-NXR](#): > > CPU and GPU are just idling, waiting for the RHIT to finish Have you had a chance to profile 5.5 just yet and what CPU/GPU are you setup with? I’ve referenced your quote here. [Lumen GI and Reflections feedback thread - Development / Rendering - Epic Developer Community Forums](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108/2020) If you scroll up I pleaded for a flag to still be able to use DX11 SM5 SWRT cause DX12 was just a huge overhead simply by swapping the RHI … We got the flag coming in a 5.5 hotfix however the lumen engineer seems unconvinced of my stat output if you read further up in the thread. > [@Lumen GI and Reflections feedback thread](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108/2011): > > DX11 SM5 - 4.26ms starting cost (235fps) The specific machine I benched was a Ryzen 5 5600, 32gb 3200htz, samsung M2 2tb, RTX 2080ti But unlike the sage above I’ve gotten consistent better performance out of AWS G4s with Radeon V520, Steamdeck, GTX series paired with both intel and AMD - All running DX11 SM5 vs DX12 SM5 --- _[View the full topic](https://forums.unrealengine.com/t/unreal-engine-5-4-extremely-bad-performance/1821126)._