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They already do those things.

Logged out users see a "snapshot" of the page updated every so often.

And I really don't think that caching pages per session would really help with their load all that much. Why not just use HTTP cache headers at that point?

Plus while you don't really need to show votes ASAP, logged in users will want up to date comments.




This is where ESI helps. You can portions of the page that don't change much.




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