It’s still slow for me. I even tested out 1.27.12.00 where I got slowness. But this is even the case with the last version of the syncthing app for android (non-fork).
The only version that worked as expected for me was the 1.9.0. Even the scanning of the folder is faster in 1.9.0 compared to the 3-4 versions I tested.
I read somewhere that this might be caused because of not using the Media Picker but I’m not sure.
Edit - I will try to start the test from 1.9 onwards to see where it started happening and will provide the details.
zzz-io
August 1, 2025, 8:59am
28
@Catfriend1 Hey sorry, I’m in the middle of moving and my computer was in storage.
Couldn’t parallel install the debug APK. Uninstalled 1.27.12.00.
Installed debug_1.30.0.90.apk
Restored backup settings
Created a new shared folder job on phone “DCIM-Test”
Accepted new shared folder on PC
I’d tentatively say it works. It appears to have synced the 50Gb in 15~mins.
the Syncing percentage counter increased over time.
the transfer speed/total transferred numbers weren’t updating.
I need to do another test sync when the folder has finished scanning on the phone. Scan progress appears to have frozen.
Screenshot of Syncthing-Trayzor on PC:
2 Likes
Thank you. We will need exactly this info narrowed down.
Catfriend1
(Catfriend1)
August 1, 2025, 10:03am
30
I see a log “scan completed” on your screenshot. Where is the indicator that the scanning hangs?
Restored backup settings
Please also retry without importing your settings as that will remove shortcuts where the app skips initial work to do on the phone side.
Thanks for testing!
// maybe offtopic from my side: I have never used a quic lan connection before in my setup, but it seems totally valid because syncthing supports this. If you’d like to dig deeper and get more near to my setup, you could optionally enter direct tcp4://ip:port addresses on both sides and redo the test.
zzz-io
August 1, 2025, 12:09pm
31
The android application stats appeared to have stopped updating but the file count and total folder size continued to (slowly) increase on the PC side.
I stopped the sync and restarted the phone app, then let it finish scanning. It’s now correctly showing the folder stats as image above.
Catfriend1:
Please also retry without importing your settings as that will remove shortcuts where the app skips initial work to do on the phone side.
Thanks for testing!
// maybe offtopic from my side: I have never used a quic lan connection before in my setup, but it seems totally valid because syncthing supports this. If you’d like to dig deeper and get more near to my setup, you could optionally enter direct tcp4://ip:port addresses on both sides and redo the test.
No worries! Thank you for your efforts
I’ll do a fresh debug APK install. Then:
set things up manually, use TCP//IP:PORT
let it finish scanning the 128GB folder on phone first
accept the folder share on PC
see if speeds are reported accurately/if it slows down immediately
Let me know if you want me to do something specific for the test method.
Side note: While testing some versions of the app (including this debug version), the initial setup wizard navigation buttons are covered by the navbar on my phone.
1 Like
Catfriend1
(Catfriend1)
August 1, 2025, 12:43pm
32
The overlay was a problem in the past for a few versions, yes. Pls try working around by rotating the phone. It is fixed meanwhilst - but because I’d like to analyze the issue I’ve built “an older version like” for you. We can ignore that cosmetic.
1 Like
zzz-io
August 1, 2025, 12:47pm
33
No worries, I’ve been getting around it by using multiapp windows
Following the steps above, it looks like the problem persists.
There is an initial burst of speed where 7% successfully transfers, then it stops.
Side by side showing 0 transfer speed.
1 Like
zzz-io
August 1, 2025, 1:07pm
35
Catfriend1:
we know v1.28.x and somewhen stalls for you and thus is perceived slow
I need to confirm whether it’s actually stalled, or just perceived to be slow due to the transfer stats not updating.
If we look at this progress screenshot, it appears to have transferred 58GB in 20mins - 48MBps?
I have to stop for tonight, I’ll give this a try tomorrow
1 Like
zzz-io
August 2, 2025, 6:22am
36
Confirming the data transfer does actually stall. I did a fresh test using the debug apk. It transfers 20GB~ in a minute, then stops. Full log paste attached.
https://pastes.io/syncthingandroiddebug-130090-test2
1 Like
zzz-io
August 2, 2025, 6:47am
37
Android: debug_1.30.0.90.apk
PC: v2.0-rc.23
Appears to exhibit the same stalling behaviour.
16:42:25 0 MB
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1 Like
Android: debug_1.30.0.90.apk
PC: v2.0-rc.23
Also if you try to use v2.0-rc.23 on Android as well?
What about v1.27.12.0 then? Is it really fast and does not stall? Or do we need to look for another “checkpoint” where the slowness came in?
zzz-io
August 2, 2025, 9:53am
40
Issue persists
Android: com.github.catfriend1.syncthingandroid_debug_v2.0.0.0-rc.23_22eac0d.apk
PC: v2.0-rc.23
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==ABORT==
1 Like
zzz-io
August 2, 2025, 9:53am
41
Android: v1.27.12.0_9b443724.apk
PC: v2.0-rc.23
Consistent transfer - 90GB in 4mins.
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==ABORT==
1 Like
zzz-io
August 4, 2025, 6:04am
44
Success!! 131GB in 4mins!
This was done with the PC connected to my phones hotspot so I think that speed is fantastic!
Android: debug_1.27.12.90.apk
PC: v2.0-rc.23
Android:
- Full uninstall of previous apk
- Install debug_1.27.12.90.apk
- Accept all permissions
- Create shared folder "DCIM-Test2"
- Wait for scan to complete (8mins~)
- Add PC using QR code, set TCP://IP:PORT
- Toggle share "DCIM-Test2" folder to PC
PC:
- Accept new remote device prompt
- Accept new folder prompt
LOG:
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3 Likes
tomasz86
(Tomasz Wilczyński)
August 4, 2025, 10:03am
46
Apart from Syncthing itself, which had quite a few changes (see https://github.com/syncthing/syncthing/compare/v1.27.12…v1.28.0 ), there was also a bump in Go version from v1.22 to v1.23.
1 Like
Hi @Catfriend1 , I was not able to test things out due to an medical emergency. When I came back today, I so there has been a lot of testing and feedback done by @zzz-io .
So I decided to try the new test build you provided (https://github.com/Catfriend1/syncthing-android/releases/download/v1.27.12.90/com.github.catfriend1.syncthingandroid.debug_1.27.12.90.apk ) and I can say that this is working very well in all aspects including the overlay, scanning speed and transfer speed as well.
1 Like
I have tried the sync from android to windows and about to test the same for android to android.
I am not exactly sure why is the current version working well
Regarding the v1.9.0, the one I tried was of the non-fork version which did work for me. I haven’t tried your v1.9.0
I hope the last debug build you provided works well for others as it did for me. Moreover, I plan to stay on it because this is the initial sync I’m doing for my new device and once everything is ready, I will switch to the latest stable release.
Once again, thanks for your work on the fork and support in troubleshooting.
1 Like
bt90
(Bt90)
August 6, 2025, 9:36pm
51
Do we have CPU/heap profiles from such a stalling app?
@bt90 I think users are able to grab a support bundle from Settings > Syncthing in the app. Would that help?