Technical
Varnish: the cache that forces you to know logged-in users
Varnish speeds everything identical between visitors — and serves the wrong page to those who should not see the cacheable version.
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Technical
Dynamic page cache: decide what can really be cached
Caching "the homepage" seems simple — until a logged-in banner, cart and A/B test make every visit unique.
Technical
Nginx or Apache: choose by request paths, not reputation
Nginx excels as a reverse proxy and for static files; Apache still shines with .htaccess and legacy modules. The right choice is read request by request.