Updating public folder takes 90 cpu
For a connection to be established, both devices need to know about the other’s device ID.It’s not possible (in practice) to forge a device ID.
Therefore, multiple devices can share the synchronization load, in a similar way to the torrent protocol.
We believe your data is your data alone and you deserve to choose where it is stored.
Therefore Syncthing does not upload your data to the cloud but exchanges your data across your machines as soon as they are online at the same time. Syncthing and Bit Torrent/Resilio Sync accomplish some of the same things, namely syncing files between two or more computers.
In the “Remote Devices” list on the right side of the GUI, double check that you see “Address: to enable direct connections.
Second, if one of the devices is a very low powered machine (a Raspberry Pi, or a phone, or a NAS, or similar) you are likely constrained by the CPU on that device.
See the next question for reasons Syncthing likes a faster CPU.