[Koha] Koha performance on Debian

[David Liddle]

Paul, I'm sorry that I didn't proofread the commands that I suggested.
Anytime you see or execute the "koha-" commands, the particular name of the
intended Koha instance, e.g. "library" should be substituted. It seems that
in your case (and ours), those would be:

$ sudo koha-disable *library*
$ sudo a2enmod rewrite cgi headers proxy_http
$ sudo systemctl restart apache2
$ sudo koha-plack --disable *library*
$ sudo koha-plack --enable *library*
$ sudo systemctl restart apache2
$ sudo systemctl restart koha-common
$ sudo systemctl status koha-common

Crucially, the grep results for your Apache site config do not have
"Include" directives that load Plack. Start perhaps with those Plack
commands in the middle of the list above and work your way down again. See
if that changes anything.