I sync my phone camera folder (3400 files / 34GB) and have a very slow sync from android to windows.
Slow means that syncing takes forever. I have the impression it can do fast transfers (up to 100MBit/s), but there are really long gaps where nothing happens and transfer rates go down to 0.
I have read about the problems with the android storage interface, however I understand here the problem is mainly with receiving many small files and store them on the phone. My main use case is uploading from phone to PC. After vacation, uploading the ~1GB new photos takes hours.
What I tried:
Change to the new syncthing fork ā same issue
sync to a Windows and a Linux client on my PC ā no difference
sync between windows + Linux client ā after hours of sync from phone ā Windows, I start the linux client and the same amount syncs between minutes.
Further infos:
phone: Pixel 7a with android 15
path to the shared folder on android: /storage/emulated/0/DCIM
all clients are in the same LAN (connection type: TCP LAN)
GSAM battery monitor shows huge runtime on job/com.google.android.providers.media.module/com.android.providers.media.MediaService
While the camera sync is stalling, a different folder can upload 200MB in a few seconds.
Not really, the known problem is that syncing to Android will be slow if youāve got thousands of files located in the same folder, however, the other way around, there should be no issues.
Can you post screenshots of the Syncthing Web GUI from both sides? Please make sure that the information under āRemote Devicesā is visible. On Android, you can access the Web GUI from the left slide-out menu.
I was worried that your devices might be connected via a relay, which could cause the slow sync, however it doesnāt seem to be the case. Not sure whether it will have any effect on the issue at hand, but you seem to be still using the now deprecated official Syncthing for Android app, so Iād like to suggest switching to Syncthing Fork, which is kept being updated. You can transfer your current config to it (see https://github.com/Catfriend1/syncthing-android#switching-from-the-now-deprecated-official-version).
Came here just to say āme tooā and hopefully include useful data. I was running Syncthing-Fork and was trying to sync photos from Android to a computer on my local network. Details:
Syncthing Fork version 1.28.1.1
Connection type is always āTCP LANā, run mode is wifi only
Folder is /storage/emulated/0/DCIM
Contains 3278 photos/videos, 72 GB of data
Let it run for 24 hours and it still was only half done before I killed it
It would consistenly wait for long periods of time with 0 B/s upload speed, then have little bursts of 1 MB/s upload for a second, then stop
So I took the advice of alswkd4 and installed Syncthing 1.9 from the link he sent and it worked like youād expect:
Remaining 40 GB or so synced in about 30 minutes
Maintains consistent 20-30 MB/s upload speed
So something definitely changed in later versions of syncthing for android that caused an extreme loss of performance for this use case.
Note that Iāve been using the recent version of Syncthing Fork to sync other things to/from Android (also under /storage/emulated/0) without problems. So itās something about the quantity or size of the photos folder.
Iām having the exact same problem, except it occurs with every folder I try to sync. None of the solutions Iāve found online fixes it.
Using the old version mentioned above doesnāt fix the problem for me.
Syncthing used to work perfectly with just basic setup. Now itās suddenly become useless.
Hopefully a proper fix comes out, Iām going to have to go back to connecting my phone to the computer via USB and using adb (ugh).
I have the same issue with a Poco F6 on Android 15. Before with my Mi9Lite on Android9 it was running perfectly fine. Now syncing is practically impossible because it hangs on 63% with speed 0b/s. I switched to the syncthing forc..no luck now and I wonder how I could handle my files nowā¦ ; One post says switching back to version 1.9 should work. But then this would mean that the āerrorā would be in Syncthing not on Android 10+. So now Iām helpless hereā¦ maybe try to copy by USB cableā¦ poor solutionā¦
My problem here is, no one yet took the time to go up beginning with v1.9.x.y one version by the other to identify since which release the slowness creeped in. It would be easier to investigate or provide you with test builds if this info would be available. for example: v1.14.5.6=fast and v1.14.5.7=slow
I could then look up what changed in-between, revert some changes, provide a test APK, ā¦
Hi Catfriend1, I just did some testing and got these results.
Steps:
Full uninstall, not keeping data
Install
Restore backup settings
Force start, ignore run conditions
2300 files: 100GB~
1.26.01.00 - Fast
1.27.06.00 - Fast
1.27.12.00 - Fast
1.28.00.00 - Slow
1.28.01.00 - Slow
1.28.01.01 - Slow
1.30.00.01 - Slow
Fast - Stable transfer speed from Android -> Windows (11-13MB/s)
Slow - Burst of speed for a second, then 0 for minutes at a time. The speed drop-off happens almost immediately after sync starts.
Android 15
1.27.12 has been stable while I typed this reply. I hope this helps narrow it down.
I still need to take a closer look on a big screen. What in my eyes changed at a first glance:
Android service type (major change, specialUse lets the service run āforeverā whilst dataSync allowed max 6 hours of service runtime in the background)
SyncthingNative (upstream, I need to check their diff)
build scripts (minor, they were mainly converted to kotlin, java 11 stayed)
translations (minor)
Please note aside: my two phones with 10 & 5 are not āslowā during sync , but they sync ~ 4000 files at max.
Suggestion: we coule try to build the wrapper from v1.27.12.0 and put SyncthingNative v1.30.0 in to narrow down, if it may be the native or the wrapper?!
I tried this version as suggested by @alswkd4 and it really is working exceptionally well. In my case Iām syncing two Android devices (WhatsApp folder to be specific) where I have installed the 1.9.0 Version and itās not getting stuck at all. Thanks a lot for this suggestion. Moreover, it is scanning the files fast as well.
! This is the diff of what changed: