1. Restart your Router.
Startup in Safe Mode.
Launch Safari and test.
Restart normally by clicking the “Restart” button at the bottom.
Start up in Safe Mode. https://support.apple.com/en-us/HT201262
2. Disable all extensions and test.
Section: Manage extensions:
https://support.apple.com/guide/safari/use-safari-extensions-sfri32508/mac
3 If the steps posted above don't help:
Download EtreCheck, https://etrecheck.com/maspro and post the report here.
Click “Click to download” button,
Open Downloads folder, click on it to open, and then select ”Open”.
“Choose a problem” from the popup menu box, and then “Start EtreCheck” in the dialog.
Click “Share Report” button in the toolbar, select “Copy report” .
Paste the report when you reply.
Note
This is a diagnostic test.
If 5000 words limit applies:
Split the report into two parts and post as two separate posts.