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Bad UI response when the rendering points is too big

Gowin il y a 5 ans mis à jour il y a 5 ans 1

I am using winform version. If the points is about 1M points, When I try to RectangleZoom the rendered  model, the ui performances is relatively too worse for users.When I drag the model, the rectangle barely shows in a  few seconds.The zoom rectangle should be shown in a  much faster speed.How to improve the  response  speed, when the points to  render is  bigger than 1M points.

It seems it can not be  solved if  using gdi+. Now I try to use opentk or dx9.