Radeon 9200 128mb problems with OpenGL

I have this problem: using Blender, which interface is made completely in OpenGL, after some second of correctly work, my system goes really slow, with processor PIII866 at 100%, only moving mouse over bottons. Rendering time seems ok, but in this way it’s impossible to model and work with 3d.All in my system is upgraded, graphic driver, directX, but this problem is killing me. I think my radeon stops to use openGL after a while and passes it to cpu that is not good in this job. Any idea?

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