For Texture baking, there is a CPU-bound preparation step needed to establish a mapping between the Hi-Res and Low-Res Meshes before the rendering engine can take over and start the bake. Part of this process is now taking advantage of parallel_for, speeding up this step of the Bake process for many/large textures almost linearly to the number of CPU-cores. Pull Request: https://projects.blender.org/blender/blender/pulls/128964