Inertia CPU usage question

Using Breeze/Vue with inertia.js and have noticed this issue using either Chrome or Firefox.

For some reason, while running/developing an app, at seemingly random times, my pc fan will start going and stay on. When I check the running tasks, the task using the cpu (about 10%) is the browser which has only the app running (no other tabs). But the app isn't doing anything during this time.

If I go to another website, the fan goes off and the cpu usage returns to normal. Then when I go back to my app, the cpu usage remains normal and may stay that way for quite a while. But eventually, the cpu usage issue will return to the elevated state and will remain that way until I close the browser or go to another web site. This happens a few times a day and I haven't been able to figure out any logic as to what triggers the high cpu usage. Once it starts, it seems like there is some type of loop running, but it's not in my code.

This is not a show stopper, I can fix it by going to another website and then returning to my app. But something doesn't seem quite right and I was just wondering if anyone else has noticed this issue or has any idea about the cause.

Thanks