Runtime Broker is a Windows process in Task Manager that helps manage permissions on your device for apps from Microsoft Store. It should only use a few megabytes of memory.
If your RAM use is high and your PC is running slowly, an app might cause the Runtime Broker to use up to a gigabyte of RAM or more.
To check to see how much memory Runtime Broker is using:
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Open Task Manager by pressing Ctrl+Shift+Esc or select Start and enter Task Manager in the Search.
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In the Processes tab, check to see how much memory Runtime Broker is using. If its using more than 15% of your memory, you might have an issue with an app on your PC.
To stop the Runtime Broker from using too much memory:
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Select Runtime Broker from the list.
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Select End task to close Runtime Broker, and then restart your device.