[PyQt] Optimizing WebView display

[alan moore]

I ran my script with callgrind and looked at the output in Kcachegrind, 
but I didn't really grasp much of what it was telling me.  It seems that 
I'm spending an inordinate amount of time in libfontconfig.so, but 
otherwise I couldn't identify any of my functions that were slow.

The tricky part about optimizing this is that it isn't exactly the 
*program itself* that is slow -- the thin clients aren't running the 
program.  They're just receiving the X11 data from the server (which is 
actually running the code, and barely breaking a sweat doing it).

So I guess what I really need is to reduce the amount of data being sent 
to the X server to a bare minimum.  It does alright with showing a web 
page, it's the actual interactive bits (drop downs, text inputs, etc) 
that are really slow.


On 09/01/2010 02:45 AM, Nick Gaens wrote:
> Or, profile your application using a tool like Valgrind to find out what
> parts of your code in particular should be worth looking at for
> optimizing purposes. Remember the 90/10 rule: a 90 percent speed
> increase can be achieved by optimizing only 10 percent of your code.
>
> On Wed, Sep 1, 2010 at 06:02, Taylor Carrasco <crackerbunny at gmail.com
> <mailto:crackerbunny at gmail.com>> wrote:
>
>     Is the code available for us to take a look at for possible
>     optimizations
>
>     On Tue, Aug 31, 2010 at 9:09 AM, alanm <me at alandmoore.com
>     <mailto:me at alandmoore.com>> wrote:
>
>         I wrote a small browser in PyQT4 using QWebView, of course.  The
>         browser runs
>         well and does what I need, but when I deployed it to my thin
>         clients, it was
>         far to slow to use.
>
>         In fact, most modern browsers were; I had to settle on Epiphany
>         because all
>         the other browsers I tried were far to slow at showing or
>         interacting with
>         HTML controls (text inputs, drop-downs, etc).
>
>         I tried disabling all QT effects in the Trolltech.conf file, and
>         various
>         graphicssystem settings on Qapplication, but it's still slow.
>
>         Are there any other places where graphical effects can be toned
>         down or
>         optimized?  I still notice a bit of a fade-in effect on
>         drop-downs even when
>         all QT Gui effects are disabled, and this is rendering really
>         badly on the
>         thin clients (slow and lots of screen artifacts).
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> --
> Nick Gaens
>
>
>
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