# I found the copy speed of synchting relative to the operating system is too slow
**URL:** https://forum.syncthing.net/t/i-found-the-copy-speed-of-synchting-relative-to-the-operating-system-is-too-slow/8717
**Category:** Support
**Created:** [November 30, 2016, 1:41pm UTC](https://forum.syncthing.net/t/i-found-the-copy-speed-of-synchting-relative-to-the-operating-system-is-too-slow/8717 "2016-11-30T13:41:11Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@swordyang](https://forum.syncthing.net/u/swordyang)
#### Post date: [November 30, 2016, 1:41pm UTC](https://forum.syncthing.net/t/i-found-the-copy-speed-of-synchting-relative-to-the-operating-system-is-too-slow/8717/1 "2016-11-30T13:41:12Z")
Rename or move a file, syncthing does not re-transfer the file, but directly copy on the remote device local. I found the copy speed of synchting relative to the operating system is too slow. How designed of this? Have any solution to this?
---
### Author:  [@AudriusButkevicius](https://forum.syncthing.net/u/AudriusButkevicius)
#### Post date: [November 30, 2016, 2:00pm UTC](https://forum.syncthing.net/t/i-found-the-copy-speed-of-synchting-relative-to-the-operating-system-is-too-slow/8717/2 "2016-11-30T14:00:27Z")
It’s not always true, sometimes syncthing might have to retransfer even for copy, because the deletion is found and transfered earlier than the addition, which might be what you are experiencing.
---
### Author:  [@AudriusButkevicius](https://forum.syncthing.net/u/AudriusButkevicius)
#### Post date: [November 30, 2016, 2:01pm UTC](https://forum.syncthing.net/t/i-found-the-copy-speed-of-synchting-relative-to-the-operating-system-is-too-slow/8717/3 "2016-11-30T14:01:13Z")
Or deletion is sent much later than addition, so that results in a copy oppose to rename which might take a while.
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [November 30, 2016, 3:33pm UTC](https://forum.syncthing.net/t/i-found-the-copy-speed-of-synchting-relative-to-the-operating-system-is-too-slow/8717/4 "2016-11-30T15:33:40Z")
There is also a lot more to it than a pure copy, unfortunately. Each blocks gets looked up in the database, and the data hashed to verify that it was what we expected.
---
### Author:  [@swordyang](https://forum.syncthing.net/u/swordyang)
#### Post date: [December 1, 2016, 1:54am UTC](https://forum.syncthing.net/t/i-found-the-copy-speed-of-synchting-relative-to-the-operating-system-is-too-slow/8717/5 "2016-12-01T01:54:07Z")
Can make copy speed faster by adjust the block size to bigger? How to midify the block size form 128k to bigger?
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [December 1, 2016, 5:31am UTC](https://forum.syncthing.net/t/i-found-the-copy-speed-of-synchting-relative-to-the-operating-system-is-too-slow/8717/6 "2016-12-01T05:31:36Z")
You cannot, no. Sorry.
---
### Author:  [@system](https://forum.syncthing.net/u/system)
#### Post date: [December 31, 2016, 5:40am UTC](https://forum.syncthing.net/t/i-found-the-copy-speed-of-synchting-relative-to-the-operating-system-is-too-slow/8717/7 "2016-12-31T05:40:02Z")
This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.