# Cemu detailed changelog for 1.21.2# Patreon release date: 2020-09-18# Public release date: 2020-09-25CPU/JIT: Added support for instructions STHUX and RLWIMI.Provides a minor performance boost in games that utilize these instructions (e.g. Sonic Boom)Vulkan/OpenGL: Added support for integer texture samplersProject Zero seems to be the only game that uses these but no obvious visual difference was observedVulkan: Compilation of shader modules now uses multiple threadsThis gives a small speed boost for synchronous compilation since vertex and pixel shaders for a drawcall can compile in parallelIt also gives a speed boost to asychronous compilation due to using extra threadsVulkan: Fixed a rare race condition where asynchronous shader compilation could fail and lead to permanent graphic bugs for the current play sessionVulkan: Added barrier before frame output which should resolve black pixel artifacts on some GPUsVulkan: Fixed a bug that could cause device loss during swapchain creation