Hi,
Check for third party Safari add-ons.
Safari: Add-ons may cause Safari to unexpectedly quit or have performance issues
Reset Safari. From your Safari menu bar click Safari / Reset Safari. Select the top 5 buttons. Click Reset. Relaunch Safari.
Open a Finder window select your Home Folder in the Sidebar on the left. Then open the Library folder, then the Caches folder, then the com.apple.Safari folder. Move the cache.db file to the Trash. Relaunch Safari. If you still have problems ...
Check for Login Items Open System Preferences/Accounts then select the Login Items tab. Delete any files or apps you have listed there. And go to /Library/Startup Items. Move any files in the Startup Items folder to the Trash.
Troubleshoot the Safari .plist file. Open a Finder window. Select your Home Folder in the Sidebar on the left. It has a small house icon. Then open the Library folder then the Preferences folder.
Move the
com.apple.Safari.plist file from the Preferences folder to the Desktop. Now launch Safari. If Safari functions as it should, move the .plist file to the Trash.
If nothing above has helped, login to another user account on your Mac. Try Safari there.
Carolyn 🙂