Solution for Slow Viewing Using Swift's Webview

There are three main ways to view websites on the iPhone app.

• UIWebView
• WKWebView
• SFSafariViewController

Each has its own characteristics.

[UIWebView]

• The oldest WebView
• Can be added from the storyboard

KWKWebView <

• WebView Added from iOS 8
• With the same rendering engine as Safari, JavaScript is about four times faster than UIWebView
• Code implementation is required because it cannot be added from the storyboard
• More freedom than the other two

[SFSafariViewController]

• ViewController for website viewing added from iOS 9
• If you're just going to use it to view the website, the best way to do it (not if you need to handle your request)
• Image that Safari is available in the app

In simple terms, WKWebView and SFSafariView Controller are comparable to Safari, but UIWebView is low performance.

The rendering methods, such as server-side rendering and Single Application Page, vary from website to website, so users may be able to feel the load faster.

In any case, if you want iOS to display your website at high speed, you should use WKWebView or SFSafariViewController to suit your needs.

For more information on performance results, see Measure WebView performance with iOS 9!.

I hope this will be helpful.