Most Mac people use the Safari web browser because it is integrated into the macOS really well and it is fast. Occasionally, Safari bogs down. There are several things that could cause this slowness. If Safari on your Mac is slowing down some, then you might need to Manage Website Data. Here is how you do that.
Manage Website Data
You manage your website data in the “General Tab” of Safari Preferences.
When you click on the Manage Website Data button, you are taken to this screen.
Most of us will have a long list of websites, the list takes a while to load. If a particular website is giving you problems you can select it and click “Remove”.
The site will disappear.
Sometimes it is not a bad idea to just click the “Remove All” button if you are experiencing general Safari slowness. You may lose a few logins, but the damage should not be too bad.
If you are experiencing slowness in Safari, then try cleaning out your Managed Website Data.