Improve server performance
Consider the following tips to improve the performance of your server.
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Enable the Apache PageSpeed module or the Varnish (TM) web application accelerator if not already enabled.
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Consider installing the APCu, XCache, memcached or eAccelerator modules to cache and optimize your PHP applications.
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Use the mysqltuner script to check and optimize your MySQL or MariaDB database server configuration.
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If you are experiencing bot attacks that are affecting your server, filter out and deny requests by specified IP address using Apache or NGINX.