Deep & Advanced troubleshooting required!

Long post.

My WordPress installation is all kinds of FU$%@^$! further reading will denote;
Repair is a must, then we upgrade.

[Server]
Custombuilt. 2x xeons, 64gb ddr3ecc, 20tb storage redundant across the servers 12 hdd’s, Hyper-V virtual Ubuntu server 16LTS esm3 (< pending upgrade)
L.A.M.P
WP.

[_problem1]
Cannot post download files larger than xxx amount. I say xxx, because it varies. Sometimes creating a download stub in WPDMpro then adding an 80MB file to it (website download), it will work, uploading at a pathetic 6-20mb/s even though I’m on the same network as the server.
Files around 10mb will upload in a second or two. Things slow down from around 60Mb files onwards.
In comes the heavyweight, the 2GB archive. Often it will start uploading fast but stall after 170-220Mb.

Devtools shows the following culprits in use;
*admin-ajax.php | xhr | moxie.min.js?ver1.3.5:1
*admin-ajax.php | xhr | jquery.min.js?ver=3.6.0:2
and on, and on and on – without ever uploading the file, or dying as described above.
each log entry sends <900b (see image for clarification)
process.die ??

[redacted by moderator]

• This topic was modified 2 years, 6 months ago by BeatmaniaNZ.
• This topic was modified 2 years, 6 months ago by Steven Stern (sterndata).

The page I need help with: [log in to see the link]