Only one site on a server running slow?

Have you guys ever had a server running smoothly with all of your sites except one? One of my sites takes 30 seconds to 2 minutes to load pages, and I can't figure out what's causing the problem.

Dozens of other sites are working fine on the same server. If there was a bad process eating up ram, that would affect all of the sites, right?

Any quick trouble shooting I can do?

Thanks in advance for any help.

 

 

 

 

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