How to Clear the Temporary Internet File Cache in the Safari Web Browser
Apple's Safari Web browser is the default in new Mac OS X systems. The cache stores information about websites you've visited to make them load faster the next time you visit them. If you're having trouble visiting a page, seeing outdated information, experiencing crashes or slowdowns in Safari, clearing the cache may fix the issue. Clearing it periodically also prevents these types of problems from appearing.
Instructions
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Open Safari by clicking on its Dock icon. Click the "Safari" menu at the top of the screen.
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Click the "Empty Cache" option. Click the "Empty" button in the window that appears.
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Restart Safari. If emptying the cache didn't solve the problem, select the "Reset Safari" option from the Safari menu. This option resets everything in Safari and solves most issues.
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Tips & Warnings
Explaination: When you empty the temporary Internet files cache you are essentially deleting files from your computer. These files are used by the browser to provide faster retrieval time for web site content and in most cases it is effective at decreasing time to retrieve content. They also serve to provide access to web site content when you lose connection to the Internet (which is why they are also called "Offline files". However, when the collection of files in the cache become very large, the time it takes to search for the "Offline Content" becomes slower and when the browser has to look through the content with each access to a web site each web site access increases in time to retrieve content and eventually the time can become so great that the browser may fail to display the complete page, resulting in not only poor performance but also page errors.