How to test amelioration ?

I test the speed using XDebug Profiler (https://xdebug.org/), but this needs to be installed on the server.

A way to test the performance without any Server requirements is using WordPress plugins, e.g. PMC Benchmark (https://www.ads-software.com/plugins/pmc-benchmark/) (needs Debug Bar (https://www.ads-software.com/plugins/debug-bar/) installed). It isn’t as detailed as XDebug, but for a simple runtime comparison this should suffice.

Thanks ??