Nginx web server is installed and configured to provide a balance of flexibility, portability, and maximum performance. Testing Nginx on Magento many years, we have learned a lot.
Percona offers breakthrough performance, scalability, features, and instrumentation. Self-tuning algorithms and support for extremely high-performance hardware make it the clear choice for Magento.
Memcached is an in-memory key-value store for small chunks of arbitrary data from results of database calls. Zend OPcache provides faster PHP execution through opcode caching and optimization.
Cache servers are used to enhance performance by reducing the load on the database servers. Full Page Caching, with hole-punching via Varnish ESI, even for logged in visitors. SSL support through Nginx.
Redis is an open source, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
We are working with Magento since the very first version, in that time we have gained a lot of experience and knowledge in this area. Features tuning and optimization.