In a simple setup I have tested to send 2000 value changes per second from an OPC UA server to Unity with GraphQL, the Open-Source Frankenstein Automation Gateway, and the GraphQL for Unity Asset. And it could go up to 10000 value changes per second…

I had one DotNet OPC UA server with a lot of simulated tags with random data. The .Net OPC UA server is the DotNet reference implementation from the OPCFoundation, which can be found here.

On top of that the Open-Source Frankenstein Automation Gateway for GraphQL was running. It is connected to the OPC UA server. It offers a GraphQL interface to the tags of one or more connected OPC UA servers.

In Unity I had used the GraphQL for OPC UA Asset to easily connect to the Gateway, browse the tags, and subscribe to the value changes of 100 tags.

Each tag was changed by the OPC UA server every 45ms. This ends up in a bit more than 2000 value changes per seconds, which were sent from the OPC UA server to the Unity Application.

Here we see the Application running 3 times on my Laptop with an Intel(R) Core(TM) i7-9850H CPU @ 2.60GHz. In the center you see the amount of incoming value changes per second (red number). Around that number, we see some of the values coming in from OPC UA. At the bottom we see the CPU load of the Frankenstein Automation Gateway (java program) and the OPC UA DotNet Server. Both were running on an old Intel(R) Core(TM) i3-6100U CPU @ 2.30GHz.

It was also possible to increase to load up to 10000 value changes per seconds! Sending 100 values every 10ms from OPC UA to Unity…