slider gui problem

Coding Python Support
1

hi all, im experementing with a gui but whenever i make a slider its really slow at redrawing and makes the whole of blender flash. whats wrong with my code?

import Blender
from Blender.Draw import *
from Blender.BGL import *

def gui():
	glClearColor(0.5,0.5,0.5, 0.0)
	glClear(GL_COLOR_BUFFER_BIT)
	glRasterPos2i(40, 130)

	value=Slider("this",1,40,140,140,30,10,1,15)


Register(gui)
2 
import Blender
from Blender.Draw import *
from Blender.BGL import *

value=Create(0)
def gui():
   global value
   glClearColor(0.5,0.5,0.5, 0.0)
   glClear(GL_COLOR_BUFFER_BIT)
   glRasterPos2i(40, 130)

   value=Slider("this",1,
                 40,140,
                140,30,value.val,1,15,0)
Register(gui)