Web Accelerators
Hepsia has many additional features, accessed from the Advanced tab. They provide quick access to a set of advanced tools, among them the Memcached distributed memory object caching system and the Varnish Cache application web accelerator, which help you optimize your sites and apps without needing to log out of the Control Panel. Depending on the web hosting package, these features are either added by default or are offered in the form of easy-to-obtain upgrades. InnoDB and NodeJS support are available as well.

Varnish
Varnish Cache is a web accelerator also renowned as a caching HTTP reverse proxy. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is very fast and can drastically improve the speed of your website. One of the main features of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to determine how incoming requests should be handled.

Memcached
Memcached is a generic distributed memory caching system for boosting the load speed of dynamic database-driven websites. It is used to decrease the number of times an external data source (such as a DB or API) is read, by caching data and objects in RAM. The Memcached memory caching system uses a two-tier architecture. The Memcached distributed memory object caching system is used by some of the most traffic-hungry websites on the web and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js
Node.js is a software platform for building highly scalable Internet applications. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, excellent for high-performance data-rich apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.
InnoDB
InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the principal software component that a DBMS uses to create, retrieve, update, and delete data from a database. The latest release of InnoDB offers substantial improvements in performance, reliability, and functionality. It offers the standard ACID-compliant database transaction properties, as well as declarative referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.
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