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@mastodonmigration#readit[.]buzz performs well because they have Cloudflared their site, which to users means they have compromized ethics & integrity for a bit of performance. Cloudflare sees everything you do on readit.buzz including your username & password.
You can expect the same of kbin.social. They are slightly more sophisticated, but still Cloudflare-compromized. When their load hits a threshold, all traffic is instantly shared with Cloudflare.