OK.
Sooooo…
Having seen a lot of mod_http2 in the process thread… I tried to disable http2
(a2dismod http2, and then a service restart for apache)
And BOOM :
Downloads start immediatlely !!
(Also transfer rates were incomparably higher…)
So, what could be the problem here ? … getting closer though…
I have a feeling http2 is not the cause, just a symptom.
Could this issue be linked with apache MPM modules configuration ?
My a2query -M shows I’m running in event mode