If you open the dashboard from a single browser all is good.
If you open the dashboard from multiple browsers or PCs at once then these sensors on all sessions throw 'Failed to load widget' errors:
System Information
Gateways
Interface Statistics
Services
Thermal Sensors
OpenVPN Client Connections.
Havent tried them all and maybe there are more. The dashboard looks so damn good tho. Top effort team.
I think we're still working on that part to condense the requests to make concurrency better. Stephan who mainly works on this is enjoying his well-deserved at the moment but he'll back on it soon. ;)
Cheers,
Franco