Change Details

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 497.29 **Blender Version** Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `rBf1cca3055776` Worked: (newest version of Blender that worked as expected) **Short description of error** Using cycles X, opening the material preview causes my computer to lag and drop in FPS **Exact steps for others to reproduce the error** Create a new material and open the material preview with cycles x

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 497.29 **Blender Version** Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `rBf1cca3055776` Worked: (newest version of Blender that worked as expected) **Short description of error** Using cycles X, opening the material preview causes my computer to lag and drop in FPS **Exact steps for others to reproduce the error** Create a new material and open the material preview with cycles x For a new scene with default cube and default material, preview render completes in about 5 seconds. With Beckmann glass it's ~10 seconds. With Multiscatter GGX Glass, ~35 seconds. (Size of preview render: 134x150px)

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 497.29 **Blender Version** Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `rBf1cca3055776` Worked: (newest version of Blender that worked as expected) **Short description of error** Using cycles X, opening the material preview causes my computer to lag and drop in FPS **Exact steps for others to reproduce the error** Create a new material and open the material preview with cycles x For a new scene with default cube and default material, preview render completes in about 5 seconds. With Beckmann glass it's ~10 seconds. With Multiscatter GGX Glass, ~35 seconds. (Size of preview render: 134x150px)