Cookie and data clearing is best done in instances where months and months of browsing data has accumulated, or when you suspect you have a malicious cookie. Additionally, cached data can be accessed faster on the local phone than through a Wi-Fi or, worse, a cellular data connection.

Cookies often save login information, accelerating the process used when logging in to regular websites.

These performance gains from clearing, however, may not always counteract the benefits provided by retaining data and cookies. Eliminating this information also helps protect your privacy, eliminating information about your past browsing sessions and eliminating those cookies which track your habits. If your iPhone is running out of room, clearing the data can also reclaim some space. Since this is data against which the browser checks at the start of virtually every website visit, a large amount of data can decrease performance. As more and more browsing is performed through the iPhone, greater amounts of data are collected. Some speed can be reclaimed in your iPhone performance by removing cookies and data. Advantages and Disadvantages of Clearing Cookies and Data

Clearing data on iphone