Having some interesting performance differences, PHP 7.4 vs 8.1. On an average production workload, 8.1 seems to be about 25% slower than 7.4. These are database-bound workloads so most slowness is assumed to be from the DB. Doctrine, League DI. Apache mod PHP. Potentially something to do with opcache settings?
@derickr 3 seems to add a big slowdown to the initial connection establishment. Not sure how it persists connections but using mod php and Apache it was adding 100-200ms of latency per request when each request was speaking to dynamo db. This latency goes away by downgrading openssl. I'm not sure if that would happen with php-fpm if somehow that shares a connection pool with a given dnsname
@ocramius the excellent #tideways has sourced what might be the issue - DynamoDB session storage. Seems the curl request to this is taking a couple hundred milliseconds and that's on basically every request. Not sure how that's different in php8 though
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