Lower syncthing priority / load on system?

Is there any way to lower the load / priority of synching on the systems load?

I’ve noticed when Syncthing is running a large sync it’s quite CPU intensive

Is there any way to manage this ?

The priority is already low by default (see https://docs.syncthing.net/users/config.html#config-option-options.setlowpriority). If you want to make it even lower, you need to use other tools to do it. Which exactly will depend on the OS at hand. Just make sure to disable the aforementioned config option if you decide to do so, as otherwise Syncthing will ignore your custom priority (see https://github.com/syncthing/syncthing/issues/6597).

If you are still wondering, i use gomaxprocs to limit cpu utilization. Different client has dif. implementation. try searching “gomaxprocs YOUR_CLIENT”

IMO in low end device, you need this if you multitask on said device. Trade off will be the transfer speed.