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<H1><A NAME="5">5 Understanding the JpGraph caching system</A></H1>
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<P> To reduce load on the web server JpGraph implements an advanced
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caching system which avoids the burden of always having to run the full
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image script.</P>
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<P> Depending on the complexity of the image script (for example if it
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is doing several DB lookups) this could significantly improve
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performance.</P>
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<P> The rationale behind this is of course performance, and the
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observation that very few graphs are really real-time, i.e. needs to be
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updated absolutely every time the graphing script is called.</P>
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