As the new Stack Overflow homepage relies on interesting and ignored tags to decide what order questions should be placed in, caching is no longer a reason to explain why filtering is done client-side. As requested before, can we attach classes to those questions server-side instead of client-side?
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We could possibly do this for all the homepage tabs, interesting highlighting on the server is also doable.
However, ignoring on the '/questions' tabs (when hide ignored is on) is a much harder problem, as it would require a redesign of the caching code.