Fair enough, but you just listed three different tools, and you may have to go through all of them to find what's going on, and come out the other end just as lost.
I mean, I get it. I've written some stuff that screws the pooch performance-wise, and the solution isn't immediately clear. But with WP, and with enough installed plug-ins, the reason for the slowness may simply be "in order to work with WP, there is a lot of back-and-forth with the DB amongst all these plug-ins," and there ultimately isn't anything you can do about it.
WP is amazing that it does so much and works as well as it does, but let's not pretend it's not a bit of a faff sometimes.
I mean, I get it. I've written some stuff that screws the pooch performance-wise, and the solution isn't immediately clear. But with WP, and with enough installed plug-ins, the reason for the slowness may simply be "in order to work with WP, there is a lot of back-and-forth with the DB amongst all these plug-ins," and there ultimately isn't anything you can do about it.
WP is amazing that it does so much and works as well as it does, but let's not pretend it's not a bit of a faff sometimes.