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  28  <H1><A NAME="6">6 Understanding the JpGraph caching system</A></H1>
  29  <P> To reduce load on the web server JpGraph implements an advanced
  30   caching system which avoids the burden of always having to run the full
  31   image script.</P>
  32  <P> Depending on the complexity of the image script (for example if it
  33   is doing several DB lookups) this could significantly improve
  34   performance.</P>
  35  <P> The rationale behind this is of course performance, and the
  36   observation that very few graphs are really real-time, i.e. needs to be
  37   updated absolutely every time the graphing script is called.</P>
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