Gtk::Notebook page-switch decreasing response

[angelo <angelo70 gmail com>]

Hi all,

i have developed a gtkmm application and i have seen a strange response 
of the notebook widget, quite sure that i'm missing some notion on using 
the widgets in the correct way.

This is the scenario:

I have a notebook with for example 5 pages added, all the 5 widgets are 
TextView based widget. On the widgets i display the messages of some 
different network logs.

On every textview based widget i've implemented a check of the line 
count, to clean old lines, to mantain a limit of a maximum number of 
lines displayed, about 200 for now.

By the way, i noticed that at the first startup, the notebook page 
switching has a fast graphic response, and quite fast even whit all the 
windows filled with 200 lines. As the time elapse, after some hours of 
activities, the notebook page switching response is coming worse, im 
talking of delay of 500msecs about, not so much, but the reactivity of 
the page switching is really different  from the start.

this is the function i've written for the TextView old-lines deletion, 
and seems working fine:

void ScrollPanel::on_size_allocate (Gtk::Allocation& alloc)
{
   Gtk::ScrolledWindow::on_size_allocate(alloc);

   if (m_rtbBuffer->get_line_count() >= 200)
   {
       m_rtbBuffer->erase (m_rtbBuffer->begin(), 
m_rtbBuffer->get_iter_at_line(50));
   }

   /* new autoscroll, done reading ScrolledWindow documentation */
   get_vadjustment()->set_value(
       get_vadjustment()->get_upper()-get_vadjustment()->get_page_size());
}

any help is very appreciated.

Angelo Dureghello