Slow Transfer Speeds on Android

ℹ️ Support
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1
The Basics
  • Nextcloud Server version (e.g., 29.x.x):
    • 31.0.9
  • Operating system and version (e.g., Ubuntu 24.04):
    • Windows and Android
  • Web server and version (e.g, Apache 2.4.25):
    • Caddy
  • Reverse proxy and version _(e.g. nginx 1.27.2)
    • caddy (2.0?)
  • PHP version (e.g, 8.3):
    • current AIO release
  • Is this the first time you’ve seen this error? (Yes / No):
    • No
  • When did this problem seem to first start?
    • Since installation
  • Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
    • AIO
  • Are you using CloudfIare, mod_security, or similar? (Yes / No)
    • No

Summary of the issue you are facing:

I have an internet connection with (speedtest-cli) 250 Mbit/s Download and 110 Mbit/s Upload on my debian server machine. It hosts Nextcloud all-in-one with the current release via docker compose and with Caddy as reverse proxy.

From a windows PC in the same network, as the server, I get >10 MByte/s Up- and Download from the browser and similar numbers from the Windows client. I consider this okay, though one could assume ~30 MByte/s would be possible, if even the internet access is this fast.

My problem, though, is, that I only get ~1,5 MByte/s file transfers in both directions from Android phones via internet, not local wlan. Both in the via a browser link opened in the firefox app (and through the client app).
Speedtesting on the phone yields ~100 Mbit/s download. I couldn’t yet find an upload test on the phone, but even the download should far exceed, what I see on the NC file transfers.

I want people to share photos with me via NC (and I want to share with them), but the upload & download is so slow, that even 10-30 images take hours to complete ..

How can I investigate further and debug, where the bottleneck is?

2

Do you do connect direkt via https from Mobile Network to your NC or with somewhat inbetween, like Wireguard?

3

It’s directly accessible with port forwarding from the web. At this time, I don’t use wireguard or another vpn or any other service in between. Only a DynDNS service to resolve the changing IP and then a connection to the server.

4

Why not simply use also speedtest-cli for that? Just install it on your Linux-Notebook connect that Notebook via WiFI-Hotspot to your phone and start the test?

This way you may also use scp to upload files to debian server machine. scp will show speed in MB/s.

5

Ah,.. good idea. After I got notified from your post and read only the first bit, I tried the speedtest app (which I kinda didn’t want to download, but yeah..) and it really has the missing upload speed. Confirming my assumptions: phone goes by 250 Mbit/s download and 20 Mbit/s upload. So still 2,5MByte/s would be possible to upload, but I see a maximum of 1,5 MByte/s. Also I tried yesterday from a wifi network and it was much slower than 1,5 MByte/s. I will test it again tomorrow from another external wifi, which I know is much faster in both directions.
However, the question still stands: how can I analyze more closely, why I see quite slow upload speeds on the nextcloud via android/phones.