# Unreal Engine 5.5 Preview **URL:** \ **Category:** Announcements\ **Tags:** unreal-engine\ **Created:** [October 1, 2024, 7:32pm UTC](https://forums.unrealengine.com/t/unreal-engine-5-5-preview/2048423 "2024-10-01T19:32:40Z")\ **Posts on this page:** 1\ **Showing post:** 151
**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 16, 2024, 12:24am UTC](https://forums.unrealengine.com/t/unreal-engine-5-5-preview/2048423/151 "2024-11-16T00:24:07Z")
Did you see my post in release? > [@Unreal Engine 5.5 Released](https://forums.unrealengine.com/t/unreal-engine-5-5-released/2117936/53): > > I figured I’d put this here as I’m not seeing any specific release notes that make note of it or mention the loss of lumen in 5.5 dx11. 5.5 no longer supports lumen in DX11 with SM5 which is a huge loss in my honest opinion because it was by far the most performant GI supported pipeline with traditional LODs vs nanite and a lighter weight shader cost and shadow casting (CSM). In order to have Lumen GI (as of 5.5 release) now you have to enable SM6 and DX12. UE5.5 DX11 (No lo… DX11 SM5 lumen isn’t available at all anymore which is sad as it was by far the fastest GI rendering pipeline for older hardware and worked flawlessly on lower end hardware. I dug through every mention of lumen in the release notes here [Unreal Engine 5.5 Release Notes | Unreal Engine 5.5 Documentation | Epic Developer Community | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/unreal-engine/unreal-engine-5.5-release-notes) not a single mention of (deprecating lumen support for DX11) [Lumen no longer working in UE5.5 DX11 SM5 - Development / Rendering - Epic Developer Community Forums](https://forums.unrealengine.com/t/lumen-no-longer-working-in-ue5-5-dx11-sm5/2126402) Update: They are giving us a flag to toggle SM5 SWRT back on in DX11 🙂 --- _[View the full topic](https://forums.unrealengine.com/t/unreal-engine-5-5-preview/2048423)._