Main causes of lag

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Wikipedia is a server which suffers from a periodic severe lag problem.

The primary causes for this, in descending order of importance are:

  • Too many users? (speculation)
  • Poor programming? (speculation)
  • Too many searches? (speculation)

But surely these aren't insurmountable problems! After all google has a far more enormous cache with far more requests and yet regularly turns out search results in the blink of an eye!

Google also has lots of funding and thousands of servers.

How do we get lots of funding and thousands of servers then? :)