• Disable Simhub plugins. They are heavy on CPU load. Also check you CPU load in Windows Task Manager. A (quite) modern CPU is necessary because you run the game + simhub at the same time.
• Check if the dashboard itself has errors. When a dashboard is not made properly, errors occur. Every 30 seconds a new attempt is made to run the error formula again. And again, and again...
• Check for errors with property = . Add the SystemLog in Settings to see what the error is.
• Easy test, run a default Simhub dashboard and see if that runs smoothly. At least you'll know it has no errors.
• Download link to the dashboard would give us the option to actually check/test what you are experiencing.

Paid version does not matter in all cases. Like you can pay for Windows 11 license but when software runs bad, it runs bad. And when hardware is too busy, it's too busy.

• Good to know is that your screen/device also has a max refresh rate. My Vocore runs max 30fps. Which is absolutely just fine for running a dashboard. There is no actual reason to have 60fps for some dynamic numbers and some static text.
• When i develop a dashboard, I want to make sure it always runs between 30 and 60fps, so that a smooth 30fps is mostly guaranteed. No Simhub license = 10fps.
• Take rFactor2, it runs telemetry at different refresh rates. Default is at max 50fps. Which shows the 60 cannot be reached in all scenarios.

same here 

what can improve it?

I have added an overhead screen to my setup a was recommended sim hub for the info to be displayed on second monitor. 

Problem I am getting is the amount of lag. At the start of a race it seems fine for about 20 seconds then it will lag sometimes just a little and sometimes a lot, the gear changes are sometimes as much as 3-4 seconds. 

I have the paid version but still the same. 

can anyone help me?  

Thanks in advance.