Add performance tips page

admin_manual/configuration/performance_tips.rst

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+Performance Tips
+================
+
+The performance of ownCloud, like any `LAMP application <http://wikipedia.org/wiki/LAMP_%28software_bundle%29>`_,
+is dependent on all components of the stack.
+Maximizing performance can be achieved by optimizing the operations and interactions
+of the underlying network, hardware, operating systems, webservers, databases, and storage.
+
+This guide cannot cover all possible configurations and will instead
+cover tips that are specific to ownCloud or give the greatest benefit.
+
+SSL / Encryption App
+--------------------
+
+SSL (HTTPS) and file encryption/decryption can be offloaded to a processor's AES-NI extension.
+This can both speed up these operations while lowering processing overhead.
+This requires a processor with the `AES-NI instruction set <http://wikipedia.org/wiki/AES_instruction_set>`_.
+
+OPcache Extension
+-----------------
+
+OPcache improves PHP performance by storing precompiled script bytecode in shared memory,
+thereby removing the need for PHP to load and parse scripts on each request.
+This extension is bundled with PHP 5.5.0 and later, and is available in PECL for PHP versions 5.2, 5.3, and 5.4.
+
+Object Caching
+--------------
+
+ownCloud is written to take advantage of object caching.
+Object caching can be done locally with the APCu extension,
+or for distributed PHP environments using Memcached.
+Memcached servers must be specified in the "memcached_servers" array in ownCloud's config file.
+
+`Serving static files via web server <xsendfile.rst>`_
+-----------------------------------
+
+`Using cron to perform background jobs <background_jobs.rst#cron>`_
+-------------------------------------
+
+`Using MySQL instead of SQLite <configuration_database.rst#configuring-a-mysql-or-mariadb-database>`_
+-----------------------------
+
+MySQL or MariaDB should be preferred because of the `performance limitations of SQLite with highly concurrent applications <http://www.sqlite.org/whentouse.html>`_, like ownCloud.