System: Windows 10 pro 22h2 19045.3516 Intel i5-10200h with UHD 620 Driver 31.0.101.2125 Firefox ESR 115.3.0 When watching streams in firefox, I noticed that overall iGPU load is very high, up to 70%, a lot higher than watching 1080p movie with dedicated player. I found that the firefox actually only shares 10~20 iGPU load, the rest are from DWM, which load is up to 40% sometimes. Also found if I switch from the tab with streaming page to another normal webpage, DWM immediately drops its usage to about 2%, firefox still uses some load as it's still decoding. DWM usage rises if I switch back. I tried force firefox to use nvidia dGPU, firefox does use nvidia card to decode, but the DWM problem said above still apply. See attatched image as prove. Cross reference to intel community thread: https://community.intel.com/t5/Graphics/High-iGPU-load-when-watching-streams-in-firefox/m-p/1528571#M123027