The setting range is up to 10 kmh more or less in 1 kmh increments, starting from the device's standard value.
Realistic players can use this to slow down their devices a little, which is particularly useful for youngtimer and vintage devices. However, the working speed can also be increased.
Another criterion for setting the working speed can be the existing farm tractor. If your own tractor has little reserves in relation to the device (e.g. cultivator or plough), then the working speed should be set somewhat lower.
In multiplayer, each player can buy an attachment with the working speed they prefer, which means that the same attachment may be available with different working speeds in the game.
Adjusting the working speed works for all attachments, whether from the main game, a DLC or mods.
There are some mods where the working speed does not correspond to the usual standard values; this can then be adjusted via the shop configuration.