[Webkit-unassigned] [Bug 55973] Provide a WebView knob to disable DNS prefetching

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=55973





--- Comment #3 from marco <marco at peereboom.us>  2011-03-09 03:57:12 PST ---
Updated the patch with all your suggestions, thanks :-)

My non-scientific setup is as follows:
* OpenBSD 4.9
* WebKitGTK 1.2.7
* xxxterm browser 1.348
* adsuck 2.1 (DNS server that spoofs NXDOMAIN for unwanted servers)

I rigged the browser to display total page load time.  Where total page load is
defined as time spent between WEBKIT_LOAD_PROVISIONAL and WEBKIT_LOAD_FINISHED.

I ran it through a number of websites and got the following results:
prefetch 0:  page load time: 2.148816  ->   http://slashdot.org/
prefetch 1:  page load time: 7.705360  ->   http://slashdot.org/

prefetch 0:  page load time: 0.973012  ->   http://news.google.com/
prefetch 1:  page load time: 19.757806  ->   http://news.google.com/

prefetch 0:  page load time: 1.504187  ->   http://www.wired.com/
prefetch 1:  page load time: 3.965751  ->   http://www.wired.com/

prefetch 0:  page load time: 1.283165  ->   http://www.theregister.co.uk/
prefetch 1:  page load time: 1.759814  ->   http://www.theregister.co.uk/

prefetch 0:  page load time: 2.288612  ->   http://www.techreview.com/blog/arxiv/
prefetch 1:  page load time: 3.196511  ->   http://www.techreview.com/blog/arxiv/

prefetch 0:  page load time: 2.149060  ->   http://www.cnn.com/
prefetch 1:  page load time: 5.169388  ->   http://www.cnn.com/

prefetch 0:  page load time: 2.192299  ->   http://espn.go.com/
prefetch 1:  page load time: 7.610725  ->   http://espn.go.com/

That is what I mean by "quite a bit snappier".  The browser seems to load pages
at a linear speed instead of bumping along (by observing the completion bar).

This is just the performance aspect for me.  I can go into the security issues
as well but I think those have been described before in other bugs.

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