Out-of-process rendering was one of Chrome’s earliest innovations, and we’ve always wanted to bring its benefits to our iOS users. Unfortunately UIWebView, the component used to render web pages on iOS, is in-process, so that’s never been possible before. The introduction of WKWebView in iOS 8 gave us that opportunity, though migrating to the new framework brought significant challenges. In Chrome 48 we’ve made the switch from UIWebView to WKWebView, leading to dramatic improvements in stability, speed, responsiveness, and web compatibility.
The biggest change is in stability: with WKWebView’s out-of-process rendering, when the web view crashes or runs out of memory, it won’t bring down all of Chrome with it. As a result, Chrome crashes 70% less with WKWebView. Even when counting the “Aw, Snap!” page shown when the renderer crashes, there’s still a big improvement.
The Chrome team is committed to improving stability and performance. We hope that you enjoy these changes and we are working hard on further improving your browsing experience on iOS.
Posted by Stuart Morgan, Software Engineer and Migratory WebView Watcher