# Epic's GPUlightmass **URL:** \ **Category:** Rendering\ **Tags:** unreal-engine\ **Created:** [March 5, 2020, 12:52pm UTC](https://forums.unrealengine.com/t/epics-gpulightmass/139357 "2020-03-05T12:52:56Z")\ **Posts on this page:** 1\ **Showing post:** 844
**Author:** ![yujiang.wang](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@yujiang.wang](https://forums.unrealengine.com/u/yujiang.wang)\ **Post date:** [February 10, 2026, 10:59am UTC](https://forums.unrealengine.com/t/epics-gpulightmass/139357/844 "2026-02-10T10:59:45Z")
# Release 5.7.2 2026.02.10 [https://downloads.luoshuangfw.io/gpulm-releases/GPULM-5.7.2.7z](https://downloads.luoshuangfw.io/gpulm-releases/GPULM-5.7.2.7z) [Back to release list](https://forums.unrealengine.com/t/epics-gpulightmass/139357/667) ![JeyNOBusJo](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/b/5/ab5660b7f11bbffee28a466b066bfa1123d8c275.png) ### Important changes - GPU Lightmass speed mode is no longer tied to viewport realtime. Instead, you manually switch between low and full speed. - Interactive preview is now opt-in. Before this change, GPULM needed to allocate a big-enough pool (size controlled by GPULM Settings → System → Lightmap Tile Pool Size) so that it can contain all the tiles on your screen needed for interactive preview. The default value resulted in 55^2 tiles allocated which translated to ~1.5GB VRAM. - Now if interactive preview is turned off, GPULM will only allocate the minimal amount of VRAM which is around ~200MB. GPULM will also switch to full speed automatically. ![MUOf5n7rvn](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/8/f/08f5096a60e267d0b9b7a9ba62633fbc128c5e36.png) - If virtual texturing & virtual texture lightmaps are disabled, GPULM will disable interactive preview and switch to full bake as well. --- _[View the full topic](https://forums.unrealengine.com/t/epics-gpulightmass/139357)._