Easy Anti-Cheat (EAC) and BattlEye are the two most common third-party anti-cheats. Each has a different implementation and different performance characteristics.
Easy Anti-Cheat
EAC runs as a service (EasyAntiCheat_EOS.sys or EasyAntiCheat.sys) that launches when the game starts. It monitors process memory, scans for injected code, and validates game file integrity.
Performance overhead: minimal direct CPU cost. Indirect effects:
- Blocks certain overlays and tools that hook into the game process
- Scans cause small read overhead during loading
Games using EAC: Fortnite, Apex Legends, Rust, Dead by Daylight, many others.
BattlEye
Also kernel-level. Scans memory actively during play. Generally considered more aggressive than EAC in its monitoring.
Performance overhead: slightly higher than EAC due to more frequent memory scanning. On older hardware (4-core CPUs), the scanning overhead is more noticeable.
Games using BattlEye: Rainbow Six Siege, PUBG, DayZ, many others.
Compatibility with system tweaks
Both anti-cheats interact with system-level changes:
- MSI mode for GPU: compatible, no issues
- Registry priority tweaks (IFEO, MMCSS): compatible
- Kernel-level monitoring tools (LatencyMon while gaming): may trigger detection
What to avoid while anti-cheat games are running
- Cheat Engine (even on non-anti-cheat games)
- Kernel-level debugging tools
- Some hardware monitoring software that hooks drivers
Standard Windows optimization registry tweaks are fully compatible with both EAC and BattlEye.
System optimization compatible with all major anti-cheats at https://terweb.lt/
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