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]
Comment on attachment 302993 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=302993&action=review
> + return NO;
https://trac.webkit.org/changeset/213182 and https://trac.webkit.org/changeset/213183.