Here are some possible mitigations.

First, make sure your ZeroTier connections are optimal:

Router Configuration Tips

Disable UDP

1. Run gpedit.msc.  (type “edit group policy” into the Start Menu)

2. Navigate to Computer Configuration > Administration Templates > Windows Components > Remote Desktop Services > Remote Desktop Connection Client. 

   Set the "Turn Off UDP On Client" setting to Enabled.

See this superuser post for more options and info

Lower RDP Experience Settings

If the purpose of your ZeroTier network is solely remoting into office workstations, don’t miss our example rule sets

Hub and Spoke

Remote Desktop Only