[Bug] Significantly slower when transferring files from Android to Windows PC

[Gerrno]

Describe the bug
It slows down significantly when transferring files from Android to Windows PC.
Transferring the same file from a PC to an Android phone is speedy enough.
However, it is very slow when transferring the same file from an Android phone to a PC.
Transferring one or two photos is possible, but if the file is larger than tens of MB or 100 MB, the speed becomes so slow that it becomes unusable.
I tested Zip files, mp4 videos, and exe files.

To Reproduce
Steps to reproduce the behavior:

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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Desktop (please complete the following information):

• OS: Windows 11
• Browser: Chrome PWA
• Version: Chrome 131

Smartphone (please complete the following information):

• Device: Poco F3
• OS: Android 13
• Browser: Chrome PWA
• Version: 131

Bug occurs on official PairDrop instance https://pairdrop.net/

YES

Bug occurs on self-hosted PairDrop instance

YES

Self-Hosted Setup

linuxserver image, docker, Debian

Additional context
Add any other context about the problem here.

[bt4ibwem8]

@Gerrno
Did you try Firefox on both sides? For me it works very fast. I am on Android 13.

[XxXxXxXxXxXxXxXxXxXxXxXxXxXxXxXxXxXxX0]

Same problem

Desktop (please complete the following information):

OS: Windows 10
Browser: Chrome PWA
Version: Chrome 133.0.6943.127
Smartphone (please complete the following information):

Device: samsung s23 Ultra
OS: Android 14
Browser: Chrome PWA
Version: 133.0.6943.121

Self-Hosted Setup

linuxserver image, docker, Debian

[Rudxain]

I tried Android (12 & 14) and Debian 13, both Firefox (latest stable directly from Mozilla, not Debian main repos), and it always falls-back to TURN server, even when all devices are IPv6 (including router)

[schlagmichdoch]

[…] and it always falls-back to TURN server, even when all devices are IPv6 (including router)

In what configuration? On the same network or over the internet?

Have you deployed your TURN server via IPv6 and added a AAAA entry for your TURN server to your domain? Otherwise you will not be able to benefit from IPv6 on your devices.

Please open a separate issue for your problem.

[schlagmichdoch]

Describe the bug It slows down significantly when transferring files from Android to Windows PC. Transferring the same file from a PC to an Android phone is speedy enough.

This is indeed a problem as the code to chunk a file and send it is pretty slow and its speed depends on the device, the browser, and whether the device is in energy save mode.

This will be improved in #267

[Rudxain]

Please open a separate issue

#387