Hi Rooters, I am now dealing with slow reactions related to a very big ntuple. I draw a 1D histogram from a big ntuple with some certain cuts. It takes sometime. When it is finished, if I want to for example, add a text, the reaction is always very slow. My naive thougt is the canvas should only contain a small histogram, so the reaction should be the same regardless if the histogram is from a large ntuple or a small ntuple. But if I save this canvas and quit and enter root and load this cancvs again, it is still very slow. It seems the canvas still carry all those ntuple informtion but now I only care this canvas. I believe I can deal with this by just saving the histogram, not the canvas. Still I want to know if there is other way out. Thanks, Hank
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