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Slrpnk instance is down till mid July; they might relaunch their server on piefed.
(programming.dev)
This is a most excellent place for technology news and articles.
Yes, I also suspect that at a certain scale it would make a difference, but with a single Postgres database and no advanced clustering or so, the real-life performance metrics of a medium sized Lemmy instance strongly point to Postgres being the bottleneck and not the Python or Rust codebase of the rest of the software.