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It's a patch I started in March this year that, according to my measurements, about doubles the 
throughput
github.comAdd request pool to improve delivery performance by Gargron · Pull Request #10353 · tootsuite/mastodonFix #7909
Use keep-alive connections to each site, in connection pools, to reduce DNS/TCP/SSL handshake overhead. Keep connections for 300 idle seconds, then clean them up.
Benchmark: 400 ActivityP...