Hi,
On 25 March 2013 11:28, Olivier Tilloy <oliv...@tilloy.net> wrote: > Hi all, > > I have been observing that the rendering of web pages in a QML browser > seems to happen in one go at the very end of the loading process, as > opposed to other webkit browsers (such as chromium). > > In my tests, I deleted the cache and I intentionally slowed down the > network interface to better observe when rendering starts to happen. > I’ve mostly experimented with http://nytimes.com, which is a rather heavy > page. I’m running those tests on an x86 desktop machine, but the same > results are observed on mobile hardware (armhf). > > With the QML MiniBrowser compiled from webkit trunk against QtWebKit 5.0, > nothing is rendered until the page is fully loaded (i.e. the webview > remains completely blank until the progress bar reaches completion). > > Just quickly ran a test with MiniBrowser on my desktop and for me with a clean cache even heavy pages like nytimes.com start to render when the progress bar is at about 50% completion. Although this probably varies depending on network and HW speed. This is comparably similar behaviour as you would experience with Safari on Mac. > With chromium (25.0.1364.160-0ubuntu0.12.10.**1), rendering is clearly > progressive, with elements of the page being displayed before loading is > complete (and of course, some re-layout happening). > > With Chromium the perceived page load / rendering speed is much faster because the browser uses a variety of speculative optimization techniques to speed up page loading. Among others these are resource pre-fetching and page pre-rendering, which are implemented in the browser [1] and depend on mouse-hover and usage heuristics. > Is this a known issue/feature? Are there some build options that I can > experiment with to tweak this? > As far as I know we have only access to DNS-prefetching with WebKit2 QtWebKit, which is enabled by default. > > Thanks! > > Olivier > > /Andras [1] http://www.igvita.com/posa/high-performance-networking-in-google-chrome/
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