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