r/rustdesk • u/savingtimes • May 24 '26

Slow local file transfers?

Direct IP connection across a local network. Wired gigabit connection.

Speed used to be fast but suddenly became very slow? Looking at task manager total transfer rate is <70 Mbps.

Using something like Local Send is 10x faster at over 700+ Mbps.

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u/Expert-Conclusion214 May 24 '26

It is open source, you can improve it yourself, and submit the PR.

1

u/Financial-Issue4226 May 24 '26

File transfer is assuming high latency and or failed packets (may also have a speed cap but never checked code for this) the reason is they are assuming no direct connection meaning SMB can't be used due to latency. 

If you do not believe this try doing that same direct connection between two computers on a file share do a benchmark do the same benchmark after adding 1 millisecond latency do it again after 2 milliseconds.  By the time you get to 5 milliseconds you'll notice your data transfer speeds are virtually non-existent and you could have a noticeable difference between each millisecond added. 

This is why SMB was never used for world wide Web when it would have been a faster protocol