I used to get a lot of similar freezes on QGIS 3. It was traced to the browser window being full of files that I never would use for QGIS. So if your browser window within QGIS has a lot of irrelevant stuff, you could try clicking on each one and selecting, "Hide from Browser" option. This should ensure that QGIS is not wasting time looking through a lot of directories that you would never be using with QGIS anyway.
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