[Qt-interest] Qt TabWidget Optimization

[Sean Harmer]

On Thursday 29 January 2009 05:11:29 Ekta Sarvaiya wrote:
> Hi,
>
> I have a tab-widget and 7 tabs with lots of data and different dialogs
> on it.
> Just now I am working on optimization..
> It takes lot of time to switch from 1 tab to other and for opening other
> child dialogs.
> If u have any idea,please suggest it to me.
First thing to do is to collect some profiling information about what is 
causing the app to be slow. Use some strategically placed 
QTime::start()/restart()/elapsed() calls or run your app through valgrind.

If creating the widgets on each tab is taking a long time at application 
startup, try using deferred initialisation. That is use a QTimer to create the 
widgets on the non-visible tabs in the background whilst the user is doing 
things on the first tab. Alternatively only create the widgets on the other 
tabs when the user switches to that tab.

What sort of architecture are you running on? Does it have a floating point 
unit? If not, are you doing lots of floating point calcs using a soft-float 
implementation? That will kill perceived performance.

Also, as Tony suggested, try boiling it down to a simple test case to see if 
you still get performance problems. Then start adding in your complex widgets 
one at a time to see which is causing the problem. You can't optimise until 
you know where to optimise.

Good luck,

Sean