You have one core available for the editor. In this case it may be not starting any ShaderCompileWorker-s at all and doing the whole work on the main thread, so it may not be hanging, just the process can take hours given such constrained resources.
You have one core available for the editor. In this case it may be not starting any ShaderCompileWorker-s at all and doing the whole work on the main thread, so it may not be hanging, just the process can take hours given such constrained resources.