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Your server admin can use some tools, such as "top", to see exactly
what on your site is causing the high load. By far the most common
cause is a PHP script running poorly designed SQL queries against
a poorly designed database. Very often, looking at MySQL's slow
query log you can find a query or two that is causing a bunch of
load. That can then be fixed by rewriting that query or two and probably
adding an appropriate index to the database.
If you have a LOT of sluggish PHP code, a simple caching system
can often be added in just a few minutes and reduce load by 90%
or more.
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