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Echo everything about plugins. Also the themes you're using can eat up CPU power and ram. If its got a ton of calls to the database it is more intensive to process each page every time someone goes to it.
If you aren't already, you NEED to set up each blog with the wp super-cache plugin which will drastically cut down resources needed for serving pages to visitors. I would do that before moving host and having a look over the next month to see if you experience the same issues still. WP Super-Cache stores your pages as static so goodbye to all the database calls. Its smart enough to know when you update or add content to refresh the cached version of the page.
I would think that would do the trick for you, especially if you can cut down most other plugins as well - - they are usually poorly written and use up way more resources than they should (again, mostly via endless calls to the database).
hope that helps.
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-- Jerry
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