AdMob repeating message in log: "ProcessThrottler::Activity::invalidate: Ending foreground activity..."

When I run an app using the AdMob plugin on a device, the log fills up with this message:

ProcessThrottler::Activity::invalidate: Ending foreground activity / 'WebPageProxy::runJavaScriptInFrameInScriptWorld'
ProcessThrottler::Activity::invalidate: Ending foreground activity / 'WebPageProxy::runJavaScriptInFrameInScriptWorld'
ProcessThrottler::Activity::invalidate: Ending foreground activity / 'WebPageProxy::runJavaScriptInFrameInScriptWorld'
....

It keeps repeating with a high frequency.
The app is showing a banner, so it maybe related to that.
Also users of the app noted that the app gets slow and laggy after some time.

Does anyone know what that means or how it could be fixed?

Cheers!

throttling is when your device gets too hot and then it starts limiting cpu usage to cool down.
You got to make a performance check on your app.
Could be a memory leak

Thanks for your response!

It is related to AdMob(-plugin). Without it the messages disappear.
The issue is mentioned here as well (quite at the bottom):

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