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There are many types of caching that will improve website performance. Here are just five:

MySQL query caching

Every read query that Symphony executes is cached by MySQL. It is important to understand that this is not the result of the query, but the SQL statement itself. MySQL retains a pool of these statements so that they are quicker to execute in the future. This is pretty standard, and you can use it in your own applications too by using SELECT SQL_CACHE for your read queries.

Object caching

Once the database has been queried, the results are used to build objects (pages, data sources, sections, field, entries etc.). These objects are alive only for the lifespan of each page, and are destroyed at the end of each request. Systems such as Wordpress allow these objects to be cached and persisted between each page request (using APC, Memcache, flat files or MySQL), thereby shared between all users. Symphony doesn't do this, but it really should.

Fragment caching

If you have one piece of a p

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<!-- Add the 'math' namespace to your XML stylesheet (so we can use 'math:random') -->
<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:math="http://exslt.org/math"
    extension-element-prefixes="math">

<!-- Pick a random number between 1 - 10 and set as a variable -->
<xsl:variable name="random-bg">
    <xsl:value-of select="(floor(math:random()*10) mod 10) + 1" />
</xsl:variable> 

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<xsl:output
     method="xml"
     doctype-system="about:legacy-compat"
     encoding="UTF-8"
     indent="yes" />

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<xsl:variable name="html-ready">
    <!-- prepare the HTML as you want it -->
</xsl:variable>

<!-- stringify it -->
<xsl:call-template name="nodetostring">
    <xsl:with-param name="node" select="$html-ready"/>
    <xsl:with-param name="esc-dblq" select="true()"/>
</xsl:template>

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<!--
    SEARCH & REPLACE
    string:    The text to be evaluated
    search:    The character or string to look for in the above string
    replace:   What to replace it with

    The output will neatly concatenate the string with replacements made.
--> 

<xsl:template name="search-and-replace">

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<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<!--
    Name: DATA SOURCE PAGINATION
    Version: 1.5
    Author: Nick Dunn <nick@nick-dunn.co.uk>,
            Nils Hörrmann <post@nilshoerrmann.de>, 
            Ian Young <i.young@me.com>
    URL: https://gist.github.com/ijy/6572186

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<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 
<!--
  Name: DATA SOURCE PAGINATION
	Version: 1.4 with custom elements
	Author: Nick Dunn <nick@nick-dunn.co.uk>, extended by Nils Hörrmann <post@nilshoerrmann.de>
	URL: http://symphony-cms.com/downloads/xslt/file/20482/
 
	Required Parameters:

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class Store_shipping_zones extends Store_shipping_driver
{
    /**
     * Calculate the shipping total for an order.
     * Use print_r($order) to see all the fields available to you.
     * The fields available also match those in the Checkout tag:
     * http://exp-resso.com/docs/store/tags/checkout.html
     *
     * @param array $order
     */

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<?php
 
require_once(TOOLKIT.'/class.event.php');
 
Class eventmerge_get_param_arrays extends Event {
 
    public $eParamFILTERS = array(
 
    );