Sometimes the Safari web browser is slow at loading web pages or fails to display them correctly. This type of problem happens when the browser cache becomes corrupt. This can be fixed by heading to your browser settings, clearing the browser cache and deleting installed cookies. In doing so, you’ll purge your browser from the temporary files, preferences, and cached data originating from the problematic websites.
How To Clear the Browser Cache in Mac OS X
Launch the Safari web browser. Click on Safari menu > Reset Safari:
In the window that opens, tick the Empty the cache and Delete Cookies checkboxes. Click the Reset button at the bottom right:
How To Clear the Browser Cache in iOS
Go to Settings > Safari > Clear History and Website Data and tap on Clear: