The difference between HLDS and ReHLDS mainly comes down to performance, security, and flexibility.
HLDS (Half-Life Dedicated Server) is the original server engine developed by Valve. It is closed-source, outdated, and has limited capabilities for modern server needs.
ReHLDS is a reverse-engineered and improved version of HLDS. It is actively maintained and introduces many enhancements.
Key differences:
1. Performance
ReHLDS is optimized and uses fewer system resources, resulting in a more stable and smoother server experience compared to HLDS.
2. Security
ReHLDS fixes many known vulnerabilities present in HLDS, reducing the risk of crashes and exploits.
3. Extensibility
ReHLDS provides more control and additional hooks for developers, especially when used with AMX Mod X and ReAPI.
4. Plugin compatibility
Many modern plugins require ReHLDS and may not work on the original HLDS.
5. Bug fixes
ReHLDS resolves long-standing engine issues such as hitbox inaccuracies and networking problems.