How Do I Quickly Redraw Zedgraph

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C#

C#4.0

I create a winfrom preoject contains zedgraph control, at first i add about 4000 points into CurveList[x], call myCurve to add list to zedgraph, the units of this pointlist's XAxis is like (ms), when i choose it to (m), i through to each point's xValue divided by 1000, and call zedGraphControl.Refresh();
because Each point to cover each other the line looks like a squared pie chart , both maximize and minimize the winform , it respons slowly, likes struck

if there a way to avoid the zedgraph redraw quickly, and change each points's value not by divided or othen operator

I use this code to change points's xValue, and then refrech zedgraph

for (int iLoop = 0; iLoop < zedGraphControl1.GraphPane.CurveList[1].Points.Count; iLoop++)
                        {
                            zedGraphControl1.GraphPane.CurveList[1].Points[iLoop].X /= 1000;
                        }
zedGraphControl.Refresh(); 

if anynone konw what i say and how to resolve this questions, please reply me, thanks
poor english