Battle Encoder Shirase is described as 'BES is GPL free software that controls per-process CPU usage: an “active” software CPU cooler. It throttles CPU-hungry application(s) when asked' and is an app. There are 2 alternatives to Battle Encoder Shirase for Windows. The best Battle Encoder Shirase alternative is Process Lasso, which is free.
Real-time process and CPU affinity optimization utility with ProBalance technology to preserve responsiveness. Automates rules, power schemes, and core selection. Mitigates system slowdowns, enables persistent affinities, watchdog monitoring, and instance limits, running lightweight.
Process Tamer is a tiny utility that monitors the CPU usage of running processes and automatically lowers the priority of processes that are overloading the CPU until their CPU usage returns to a reasonable level.
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Battle Encoder Shirase is not a process priority optimizer, it is a process throttler, where it can reduce the CPU cycles given to a process even if that process is the only high-cpu program running. Process Lasso is not capable of doing that -- it merely adjusts the process priority and core affinity.