Debug slow sending

[arada]

@ibPeter

Perhaps this is the solution for your problem:

Is 3.2.5 much slower than 2.10.18?

I have been using 2.10.18 for a few years. I am now trying out 3.2.5. But the most noticeable problem is that it is very slow, for approx 50% of the clicks I do in the admin pages. For example, opening a message sometimes takes less than 1 second, and yet sometimes takes 10 seconds. Same for logging out, Save-and-continue-editing, too.

Since I installed that files, phpList sends as fast as before.