I have a Dedi from SYS and a shared seedbox on whatbox.ca. On my whatbox plex server I can stream at any speed that my admittedly slow internet connection will allow (~5 mbps). But often my SYS plex server will need to severely reduce the quality in order to play without issue. My internet connection, while slow, is not the problem. It's very consistent, and never dips doing any other downloading. This seems to be an issue with plex streaming only. (Plex Media server is the same version on both whatbox and SYS servers).
For example, from Whatbox I can Stream 4-5 mpbs, download from FTP at 5 mbps, and download a video file from the plex/tv web app at my connection's max speed.
For my SYS plex server, I get max speeds from FTP (5 mbps), but streaming from plex I can only play around ~1.5 mbps 480p, and downloading a video file from plex web maxes out at around 2.2 mbps.
I've had similar reports from a few other plex users on my server. For example, my brother's internet is 250mbps, and he can easily get a single connection on FTP to go 50+ mbps, but anything through plex maxes around 6 mbps.
This is not a hardware bottleneck issue, as my processor (Xeon e3 1245v2) is more than capable, and the average disc I/O is 258MB/sec. I presume the problem is bad routing. I have done an MTR from the server to my home IP and there are some irregularites. Pretty severe packet loss at two points, and some jitter, though I'm not certain how to interpret any of the data.
Here's the MTR, iperf3, and system benchmark info : https://www.dropbox.com/sh/3ih5iv6up86uje7/AADmxwKKT2EbVs0_VcAPh7sYa?dl=0
Also, I found another person with a similar problem: https://www.reddit.com/r/PleX/comments/5vgh8s/speed_through_plex_much_slower_than_http_server/
If anyone has any idea what I can do to fix this, I'd appreciate the help.