I/O switching performance on a Raspberry Pi 4

[afelix]

@dpnsw

JSON for my flow is:
[{"id":"1ae67599.25720a","type":"function","z":"82f1d13f.bdbbc","name":"Measure Test","func":"var MTEndTime = new Date().getTime();\nflow.set("EndTime",MTEndTime)\nvar Duration = MTEndTime - flow.get("StartTime");\nmsg.payload = Duration;\nmsg.speed = 5000 / Duration * 1000;\nflow.set("Duration",Duration);\nreturn msg;","outputs":1,"noerr":0,"x":560,"y":340,"wires":[["7542c685.c89c28","d06d23bb.e2c868"]]}]

Please read How to share code or flow json first, then select all nodes on your flow that you would like to share, and export it. The code you've here is only the function node named 'Measure Test'.