LiteSpeed

LSWS can load Apache configuration files directly and works as a drop-in replacement for Apache with hosting control panels — replacing Apache in less than 15 minutes with zero downtime.

With its streamlined event-driven architecture, LiteSpeed Web Server can serve thousands of clients concurrently with minimal memory consumption and CPU usage.

LSWS's highly optimized code serves static content faster, taking advantage of high-performance kernel syscalls to provide static content up to 5x faster than Apache and 67% faster than nginx.

LSAPI, LiteSpeed's unique server API gets the most out of PHP, Ruby, and PHP, leading to up to 40x better PHP performance.

In addition to mod_security compatibility and a host of built-in anti-DDoS features, LiteSpeed's team of dedicated developers is always on the lookout for new Internet threats and reacts swiftly to release patches.

LiteSpeed Web Server (LSWS) is the only lightweight, high-performance Apache replacement compatible with all major hosting control panels. Upgrading your web server to LiteSpeed Web Server takes 15 minutes and improves your performance while lowering hardware and support costs:

• Event-driven architecture smoothly handles hundreds of thousands of connections without CPU or RAM spikes.
• Asynchronous I/O
• Static content up to 5x faster than Apache
• LiteSpeed's exclusive server API (LSAPI) delivers dynamic content up to 40x faster than Apache
• Unrivaled PHP suEXEC performance for shared hosting
• Available built-in page caching
• Full .htaccess support with advanced .htaccess caching to remove Apache performance bottlenecks
• Reads Apache's configuration files directly
• Control panel plugins allow Apache replacement for cPanel, Plesk, DirectAdmin, Interworx, etc. in less than 15 minutes
• CloudLinux LVE and CageFS compatibility
• Backend load balancing
• mp4/flv streaming
• Zero downtime configuration changes and server software upgrade
• mod_security compatibility
• Anti SSL BEAST and renegotiation attack capabilities
• Built-in anti-DDoS connection and bandwidth throttling

All spam filtering options are controllable form you hosting control panel.