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Agreed, optimizing your environment can be non-trivial however. I edited the index.php of my WP installs to try and get a page entirely from Memcached for users who aren't logged in, it works incredibly well (much less CPU load than using Wordpress plugins to do the same job). In theory one could probably reduce that further by using APC instead of Memcached, but it was certainly enough to get my measly EC2 micro instance through some very tough times.

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