[model/view] slow refresh on big table

[lauranger]

Hi,
I am using QTableView with a rather big model under (1500x30 cells).
When I try to scroll it is horribly slow. I tried to see what's going on by
placing a breakpoint in ::data(QModelIndex, int) and the debugger
and the window with the table side by side hoping not to interfere too much
on the refresh mecanism : dream on ! :(
The backingstore mecanism seems to want to erase the background everytime
the window gets the focus (and when the debugger stops at a breakpoint,
the window loses focus and regain it when you hit the run button).
Anyone has a tip for measuring refresh time in another way, counting the
number of times the model/view framework call ::data on the same cell for
a same refresh occasion ?
Thx in advance.

[wysota]

What kind of model do you use?

[lauranger]

I use an implementation of QAbstractTableModel with
a QSortFilterProxyModel in between.
(I was writing a much more dataful version of this message
when the spirit of the web formulars played me a bad trick).
I feel that the performance problem is not with the implementation
I wrote but with the number of rows it presents and the way
Qt seems to handle refreshes. I'd like to know from where could
I trace refresh start and refresh end.
Had anybody faced such slowliness with big model ?

[abbapatris]

If someone knows how to do this this would be great. I am also having the same issue.

[wysota]

How do you know it is the same issue?