BES
BES limits CPU use per process on Windows, with stable and test versions listed for download.
About BES
BES (Battle Encoder Shirasé) is a portable Windows tool that limits the CPU usage of a targeted process. It can throttle a process that would use 100% CPU down to 50% or another chosen percentage, helping other programs remain usable during CPU-intensive background tasks. It is free/libre open-source software under GNU GPL v2 and runs on Windows XP/7/10/11/etc. Stable 1.7.10 and test 1.8.0.39 versions are available for download; it has been used by gamers as an anti-freeze agent, though that is not its original purpose, and some users report BES does not work for them.
Key features
- Limits CPU usage of a targeted process to a chosen percentage.
- Portable; no installation required.
- Free/libre open-source under GNU GPL v2 (not v3).
- Stable 1.7.10 and test 1.8.0.39 versions.
- Test versions add Slow/Eco modes and session-end Unlimit All.
- Swap BES.exe without losing settings kept in bes.ini.
- Portable; no installation required.
- Free/libre open-source under GNU GPL v2.
- Settings are kept in bes.ini and persist when swapping BES.exe.
- Windows-only; no macOS or Linux version is mentioned.
- Some users report BES does not work for them at all.
- A few anti-virus tools may think BES is suspicious.
BES at a glance
- Website
- mion.yosei.fi/BES
- Category
- Software & Utilities › Hardware & Diagnostics
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web, Windows
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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BES FAQ
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