SABnzbd speed increases (!) when using Ookla Speedtest

[Atticushack]

I've run into a weird issue...

SABnzbd speed increases when using Ookla Speedtest simultaneously!

Regular downloading: ~20MB/s SABnzbd speed.
Running Ookla speedtest at the same time as downloading: ~60MB/s SABnzbd speed. (which is the ISP maximum)

I've tried all sorts of number of connections and other settings, but I haven't seen any relevant differences. Downloading in another app at the same time leads to faster speeds - this is not expected at all.

Does anyone have an idea about what's happening here?

[sander]

While SABnzbd is not doing anything:

In SABnzbd's upper right corner, click on the wrench symbol ("Status and interface options"), then click on first tab Status, and there click on the Refresh Circled Arrow. Post the values of the lower part here

[Atticushack]

Used cache 0 B (0 articles)
System performance (Pystone) 419568 AMD Ryzen 5 3600 6-Core Processor AVX2
Download folder speed 349.6 MB/s C:\usenet\incomplete
Complete folder speed 355.9 MB/s C:\usenet\complete
Internet Bandwidth 47.78 MB/s 382.24 Mbps

[sander]

OK, nice system specs, and Internet Bandwidth 48 MB/s. Quite good. So SABnzbd should be able to achieve that speed.

> Running Ookla speedtest at the same time as downloading: ~60MB/s SABnzbd speed.

No explanation.

How many newsservers, with which prio and number connections.

[Atticushack]

How many newsservers, with which prio and number connections.

I've got 3 different servers, tried both 0 priority for all servers and also different priorities from 0 to 2. Number of connections from 1 per server to 100. All sorts of combinations, too few connections obviously led to slower speeds. With around 20 connections per server it seemed to be maxed out.

I just checked using bittorrent simultaneously as SABnzbd, and strangely enough that too led to higher download speed for SABnzbd...

[sander]

Weird.

On another device on your LAN: what do you experience with SABnzbd?