[Interest] Extremely sluggish browser performance in Qt 5.5

rpzrpzrpz at gmail.com rpzrpzrpz at gmail.com
Fri Jun 19 03:41:28 CEST 2015

On 6/18/2015 5:38 PM, John C. Turnbull wrote:
> All I am doing is running the WebEngine Tab Browser example from Creator
> 3.4.0 which comes with the version of Qt that I downloaded which is
> 5.5.0 MSVC2013 64-bit.  I have selected to build for RELEASE and then I
> just run it.
> The machine is a powerful Dell Precision 7500 Workstation with 2 x Xeons
> and 64G of RAM and a Quadro FX 5800 GPU.
> The browser performance is absolutely woeful to the point of being unusable.
> *From:*Mark Langezaal [mailto:mark.langezaal at xs4all.nl]
> *Sent:* Thursday, June 18, 2015 9:11 PM
> *To:* John C. Turnbull; interest at qt-project.org
> *Subject:* Re: [Interest] Extremely sluggish browser performance in Qt 5.5
> Perhaps you have linked to a non optimized Qt package? (-O0 in stead of -O2)
> Not sure how this could happen.
> Did you compile it yourself?
> Mark
> -------- Oorspronkelijk bericht --------
> Van: "John C. Turnbull"
> Datum:18-06-2015 07:25 (GMT+01:00)
> Aan: interest at qt-project.org <mailto:interest at qt-project.org>
> Onderwerp: Re: [Interest] Extremely sluggish browser performance in Qt 5.5
> Anyone???
> *From:*John C. Turnbull [mailto:ozemale at ozemail.com.au]
> *Sent:* Monday, June 15, 2015 7:31 AM
> *To:* 'interest at qt-project.org'
> *Subject:* RE: [Interest] Extremely sluggish browser performance in Qt 5.5
> *Importance:* High
> Hasn’t anyone else tried out the WebEngineView in Qt 5.5 QML?  I just
> can’t explain why it takes minutes to load pages that load
> instantaneously in Chrome or Firefox.  This is really hurting us,
> especially the unusable Google Maps…
> *From:*interest-bounces+ozemale=ozemail.com.au at qt-project.org
> <mailto:interest-bounces+ozemale=ozemail.com.au at qt-project.org>[mailto:interest-bounces+ozemale=ozemail.com.au at qt-project.org]
> *On Behalf Of *John C. Turnbull
> *Sent:* Friday, June 12, 2015 5:41 AM
> *To:* interest at qt-project.org <mailto:interest at qt-project.org>
> *Subject:* [Interest] Extremely sluggish browser performance in Qt 5.5
> I am just trying out the “nano browser” in Qt 5.5 on Windows 7 64-bit
> and find it almost unusable.
> Loading **any** website is slow but it is particularly noticeable with
> Google Maps.  It can take more than a minute to render the initial map
> and then zooming in first shows just a scaled and pixelated version of
> the map and then it can several minutes for the details to be rendered
> properly.  Also, switching from map to Earth/Satellite view seems to
> take forever too.
> What could be causing this incredible slowness?  It’s not the network
> itself as the same sites load instantaneously in other browsers like
> Chrome and Firefox on the same machine and there is no proxy involved.
> Given that the primary use case I had intended for the Qt browser
> implementation is Google Maps, this is all very worrying!
> Thanks,
> -jct
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Can you run the same test on OSX and or Android?

Just provide a chance to see if 5.5 web is sluggish across more than 

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