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Forum Discussion
Sync speed is slow - Synology NAS Cloud Sync
Recently upgraded to Dropbox Pro 1TB, currently syncing my NAS (650 GB of data). Upload speed never comes above appr. 250kB/s, so first sync will take almost 2 mths.
Upload speed in both Windows ap...
Hi Guy's
Response from Synology:
Could Sync is performing sync, it is heavy process, please see below detailed information from help:
Why is Cloud Sync slower than other cloud services' PC applications?
Due to the below limitations, Cloud Sync might take longer to sync files with public cloud services than the official PC applications such as Dropbox and Baidu.
- Speed limits imposed by cloud service providers: Although no public cloud service provider has disclosed any information related to this topic, it is highly possible that public cloud servers communicate with their official PC applications through a dedicated tunnel/protocol, or impose bandwidth limitations on third-party applications that access their services on a regular basis (such as Cloud Sync).
- No incremental update: Some cloud service providers do not releases a public API for developers to track file changes. This means Cloud Sync must re-download and sync the entire file every time a file has been modified, even when you've only made partial modifications. On the other hand, cloud service providers' official PC applications might be able to re-download and sync the modified bits only, reducing sync time.
- No local network sync: Certain public cloud service providers offer LAN sync, a technique that allows one client to obtain files from existing clients in the same local area network (LAN), thus significantly boosting sync speed. However, LAN sync accesses files in client computers without notifying them, which could possibly become a security backdoor. Therefore, this feature is not included in Cloud Sync.
Given the above limitations, the syncing performance of Cloud Sync shall continue to be enhanced, while also maintaining the safety and security of your Synology NAS.
DS currently does not control the sync speed, and does not have function to enhance it.
However, we will continue to try improve our service and product.
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For me this seems to be just an issue with "Early Life Cycle" of product. No collaboration between Synology and Dropbox is done enough and no real effort put into performance. Hope they could improve this, but there seems not to be viable solution or possible enhancement on this issue.
Hi there
Finally see someone having same issue as I do. I have been trying hard to figure out which part causing the problem and I am now pretty sure it is from Dropbox. The performance in my case is actually even worse, on 30-50k/s in general I originally pointed the issue to my local network. I thought somehow my router limited it. But I switch to an old and got the same result. Then I thought it's from Synology. I tried to set the upload limit to different numbers (even up to 1000000k/s). Result is the same.
Finally something catch my eyes which is a spite every time I reset everything and restart the process. The upload speed goes up to 2-3m/s for a while (It's not just the number on screen b/c I do see some files suddenly sync completely). Then I remember the Dropbox PC client has a setting of upload limit. On PC client, by default it is set as auto (means Dropbox would control it to not taking all your bandwidth. And you can this setting change it on your own. However, for the Synology client, the setting we see is only local control. I can only guess that Dropbox still put in that same auto control to somehow look at your bandwidth. That explains why different people get a little different result.
I really want to see improvement on this in coming updates because I am planning to expand my server size and Dropbox is an important piece (somehow I do not get along with Google Driver well). For now, the only work around for me is to sync everything through a PC client and then go online and move the files to a folder that the PC do not sync with. That quite troublesome but I guess better than the never ending upload story...
