The first navigation in a Web process is slowed down checking if the protocol is QLPreviewProtocol, which involves dynamically loading Quick Look. This can be avoided for common schemes.
*** Bug 168993 has been marked as a duplicate of this bug. ***
Created attachment 302993 [details] Patch
rdar://problem/29468999
Comment on attachment 302993 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=302993&action=review > Source/WebCore/loader/ios/QuickLook.mm:130 > + return NO; NO!
https://trac.webkit.org/changeset/213182 and https://trac.webkit.org/changeset/213183.