I just had something similar occur in UE 5.1.1. My computer was near-unresponsive and task manager showed 99% of my RAM was being used. Whilst the two open Epic WebHelper processes didn’t show a lot of RAM usage, when I force-quit them my RAM usage dropped down to normal idle levels. I didn’t have the Epic Games Store open and was running Unreal via Visual Studio.
I’ve being doing plugin development and I’m using the built in Unreal CEF browser to browse for and download some files but hadn’t touched the browser during the current run of the engine.
Specs:
Ryzen 9 5900X
64GB Ram
Windows 11