Using fastest-mirror to determine WLAN speed

[Rava]

I realized inside my flat there I still get my prefered WLAN, but quite sluggish speed-wise. So I used or abused? fastest-mirror to make a comparison.
Both tests work the same way: I use my Samsung Q40 mono-core machine [Porteus 4.0 i586 (32 bit) Xfce] as WLAN access point that shares its internet via LAN and Network manager with my main machine (x88-64 Porteus 5.01, Xfce)

Here are the results: (I only give you the sorted by speed list fastest-mirror prints at the bottom)
First the access times further away from my wide south facing window, concrete walls on all sides:

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root@rava:/# fastest-mirror     # 02.12.2023 16:30
Results:
0.220437	http://ftpmirror1.infania.net/mirror/porteus/
0.224489	http://linux.rz.rub.de/porteus/
0.238846	http://ftp.vim.org/ftp/os/Linux/distr/porteus/
0.775579	http://ftp.nluug.nl/os/Linux/distr/porteus/
3.127936	http://www.mirrorservice.org/sites/dl.porteus.org/
3.356486	https://mirrors.dotsrc.org/porteus/
4.000031	http://ftp.riken.jp/Linux/porteus/
4.000890	http://ftp.cc.uoc.gr/pub/linux/porteus/
4.000950	https://mirror.yandex.ru/mirrors/porteus/
4.001200	http://www6.frugalware.org/mirrors/linux/porteus/
4.001770	http://mirrors.dotsrc.org/porteus/

And now the results for the same setup, but this time near the wide south facing window, concrete walls only on two sides:

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root@rava:/# fastest-mirror     # 02.12.2023 16:47
Results:

0.093845	http://ftp.vim.org/ftp/os/Linux/distr/porteus/
0.134303	http://ftpmirror1.infania.net/mirror/porteus/
0.140816	http://linux.rz.rub.de/porteus/
0.186235	https://mirrors.dotsrc.org/porteus/
0.240784	http://www6.frugalware.org/mirrors/linux/porteus/
0.267941	https://mirror.yandex.ru/mirrors/porteus/
0.301525	http://www.mirrorservice.org/sites/dl.porteus.org/
0.317031	http://ftp.nluug.nl/os/Linux/distr/porteus/
0.531335	http://ftp.cc.uoc.gr/pub/linux/porteus/
0.594994	http://ftp.riken.jp/Linux/porteus/
1.133955	http://mirrors.dotsrc.org/porteus/

Quite the difference, eh?

I came to the idea of using fastest-mirror for that when I realized the WLAN "strength bar" from more inside my flat (the test at 16:30) looked the very same than the one from near the window (the test at 16:47) but all pages I accessed via Pale Moon and even accessing my IMAP email server via interlink were sluggish at best.

And for some reason, that difference in real network performance is mirrored using fastest-mirror. (pun intended)