When I have Netdrive running it will sometimes cause Safari to hang on startup. Safari will open but will not load any pages for a couple of minutes. If I close Netdrive then Safari will act normally again. This seems to only happen after Netdrive has been running for a day or two.
Mac Catalina 10.15.7
Safari Version 14.0 (15610.1.28.1.9, 15610)
Netdrive loading Dropbox and Onedrive