Ispmanager 6 lite, pro, host

LiteSpeed features

LiteSpeed Web Server (LSWS) is a commercial web server used to process user requests to websites on the server with ispmanager.

LiteSpeed differs from other web servers in terms of:

  • speed
  • security
  • the way it processes dynamic content

Read more about the advantages of the LiteSpeed web server at ispmanager.com.

1 LiteSpeed ​​license supports 1 ispmanager server without restrictions on the number of users and websites.

Below is a brief description of the LiteSpeed functions available in ispmanager. A full description of the web server features is available on the developer's website.

TitleBrief description
Apache configuration filesHas full support of Apache httpd.conf and .htaccess files. No re-configuration necessary when switching from Apache
Apache modulesIs compatible with all Apache core modules, including mod_rewrite, mod_include, and mod_cache
Apply changes with zero downtime, zero downtime server software upgradeWhen restarting or updating, finishes ongoing processes in a secure way using the graceful restart feature. This allows updating the web server and applying new configurations without interrupting any processes
Asynchronous I/OSupports a form of input/output processing that permits other processing to begin before a data transmission has finished
Brotli compressionSupports the Brotli generic-purpose lossless-compression algorithm which reduces file size and page load time
Concurrent connectionsAllows for an unlimited number of concurrent connections 
CPU affinityBinds a process to one or more CPUs allowing for greater use of CPU cache
Event-Driven ArchitectureUnlike Apache, which creates a new process or thread for every connection, LiteSpeed creates just one process (or very few), which serves all connections reacting to events (client requests and external handler responses) without waiting for the connection to respond 
Full .htaccess support, .htaccess cachingHas full support of Apache .htaccess files. Unlike Apache, LiteSpeed does not check every directory for .htaccess files and uses caching, which boosts performance
GZIP compressionSaves bandwidth by compressing the files sent to the client using gzip compression
High-performance dynamic contentHandles PHP-requests up to 50% faster than Apache
High-performance static contentThanks to its event-driven architecture, handles static requests up to 10x faster than Apache
HTTP 1.0/1.1, HTTP/2, QUIC, HTTP/3Supports HTTP 1.0/1.1, HTTP/2, QUIC and HTTP/3 protocols. Thanks to HTTP/3 and QUIC, accelerates websites loading
HTTP request checkingChecks all HTTP requests and prevents access to hidden files by blocking URLs containing "/.". Allows setting the Max Request URL Length, Max Request Header Length, and Max Request Body Length to help prevent DoS attacks
HTTPS / TLSv1.3 Certificate, SSL accelerationSupports modern encryption protocols, including SSL and TLS 1.3, to ensure quick response to vulnerabilities. Delivers HTTPS pages up to 3x faster than Apache
Increases scalability of web applicationsThanks to the LiteSpeed's event-driven architecture, LSAPI usage, and request/response buffering, web applications can serve more requests and scale larger without the need to upgrade your current hardware
IPv4 and IPv6Supports IPv4 and IPv6
Just in time configurationUnlike Apache, parses virtual host configurations only when that virtual host is accessed, cutting memory usage and leading to a faster startup/restart
LiteSpeed server API (LSAPI)Can be used with PHP external applications. Its optimized coding, extra features, and native use of LiteSpeed's configurations allow for up to 40 times better performance for these web applications than Apache and Nginx
Multiple versions of PHPSimplifies running multiple versions of PHP on one server, allowing ultimate flexibility for web applications
OCSP staplingOCSP Stapling (Online Certificate Status Protocol) speeds up the SSL verification process by attaching a pre-approved certificate to the SSL handshake response removing burdens from the client and SSL certification centers
Recovers from service failures instantlyLiteSpeed's auto-recovery feature automatically launches a new server process if LiteSpeed crashes
Scripting languagesSupports  handling of CGI scripts
Sendfile()Supports sendfile(),  a "zero copy" system call that greatly reduces CPU usage when serving large static files
Shared hosting PHP, suEXEC, suEXEC for different needs

Offers three different PHP suEXEC setups for different needs:

suEXEC Worker — for hosting providers with limited resources. Offers flexibility to customize.

suEXEC Daemon — maximum speed + minimal resource consumption. Specifically designed to accelerate PHP applications in shared hosting. Creates PHP processes using a fork() system call, features full opcode caching support, and maintains user isolation.

suEXEC ProcessGroup (default mode in ispmanager) — for servers with extra resources. Provides an additional performance boost through per-user opcode caching.

SPDY supportSupports SPDY versions 2, 3, and 3.1, and will support new versions as soon as they come out
Tiny memory footprintLiteSpeed's event-driven architecture means it uses less memory than Apache, leaving more resources for other processes, like MySQL
Virtual hostingUnlike Apache, allows an unlimited number of IP- and name-based virtual hosts
Web application bufferingBuffers all client requests and handler responses, which allows for the server to handle other requests while dynamic content is being generated and be independent of the speed of the client