It uses RabbitMQ for offline processing, HAProxy for load balancing and memcached for caching. Caching proxies were the first kind of proxy server. Squid is a caching and forwarding HTTP web proxy. Zend Opcache speeds up PHP execution by opcode caching and optimization. Optimization techniques used include inlining, elision of expensive runtime properties, and inline caching. These POPs can be caching servers, reverse proxies or application delivery controllers. The transactional framework also integrates with messaging and caching engines. This means that the content page may still manipulate headers, change title, configure caching, etc. Optimization technologies include TCP acceleration, HTTP pre-fetching and DNS caching among many others. It featured Java Persistence API 2.2 inheritance caching. Caching, storing, copying etc. This framework handles the retrieval of tiles, display, caching, and user navigation. Most ISPs and large businesses have a caching proxy. Another important technique is caching, particularly memoization, which avoids redundant computations. This allows the use of flash memory on a motherboard for fast caching.