If you want to delete the browser cache in Safari, you can do that quickly with a keyboard shortcut or through the developer menu. 

Apple makes it easy: Deleting Safari's Browser cache through a keyboard shortcut

The fastest way to clear your cache is to use following shortcut: [CMD] + [ALT] + [E].

Clearing the cache through the developer menu

You can also enable a developer menu in Safari to enable several professional options. To display the developer menu:

  1. Select the first item "Safari" in the main menu and from the drop-down the item "Preferences..."
  2. A popup opens. Click on the tab "Advanced".
  3. Check the option "Show Develop menu in menu bar" at the bottom. Now you should see a new menu item in the main menu named "Develop".
  4. If you click on the menu item "Develop" you can select "Empty Caches" from the submenu items.
  5. Reload the site.