Hi,

the following fragment of code, show very different performance (and 
responsivity) between 1.1.7 and 1.1.8rc3 (and also a lot of recent 1.1.x 
releases).


-------------------------------------------

#include <FL/Fl.H>
#include <FL/Fl_Group.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Dial.H>
#include <FL/Fl_Button.H>
#include <stdio.h>
#include <unistd.h>

Fl_Dial *dial = 0;
Fl_Button *but = 0;

static void cb_but(Fl_Widget* in, void* p)
{
	but->deactivate();

	// start value of "i" was really more small, 
	// but it's to show the problem

	for (int i = 99999; i >= 0; i--)
	{
		dial->value(i/100000.0);
		Fl::check();
	}
	but->label("Restart");
	but->activate();
}

int main(int ac, char **av)
{
	Fl_Double_Window* o = new Fl_Double_Window(0, 0, 640, 480, 0);
	o->size_range(640, 480, 0, 0, 0, 0, 1);
	Fl_Group::current()->resizable(o);

	{ Fl_Dial* o = dial = new Fl_Dial(10, 60, 200, 200);
		o->box(FL_EMBOSSED_FRAME);
		o->type(FL_FILL_DIAL);
		o->color(FL_BLUE);
		o->selection_color(FL_YELLOW);
		o->angle1(180);
		o->angle2(-180);
	}
	{ Fl_Button* o = but = new Fl_Button(10, 300, 60, 60);
		o->label("Start");
		o->callback(cb_but);
	}

	o->end();
	o->show(ac, av);

	return Fl::run();
}

-------------------------------------------

I' don't see evidence of difference using single buffered Window,
but performance using Fl_Double_Window is severely worst using 1.1.x/1.1.8.

I have tested this on linux (openSuse10.2, Xorg 7.2.0rc2),

this was my config command line:
./configure   --disable-largefile --enable-shared --enable-xdbe --enable-xft 
--enable-threads --enable-localjpeg --enable-localpng --enable-localzlib


The difference is visible, once pressed button "start" and then maximizing the 
window.

or may be I'm doing something in the wrong way ?

Thanks

Andrea