Thank you for your reply Juan .
I'm having a look and the XHProf and XHGui seem to be for 9.2 version and thus would be PHP 5.4? I think it might be worth a go as the GUI looks good and Tideways is a paid for entity.
I wonder if MHQ should fork XHProf and maintain it as an element of the testing process, just like so much effort is put into Behat tests. Something for a Moodle Association vote?
Food for thought!
Kind regards,
Gareth
Update:
Could not get xhprof to work but have now profiled with xdebug:
https://docs.moodle.org/dev/Profiling_PHP
and
https://xdebug.org/docs/profiler
with the Windows binaries from:
https://xdebug.org/download.php
I was not able to get Wincachegrind to work as it kept complaining about 'Cannot find call target' when opening the profile file. So found a port of KCacheGrind called QCacheGrind: https://sourceforge.net/projects/qcachegrindwin/ which works.
xdebug is the way to go. xhprof is abandoned and will not be updated.