HI ,
I have noticed that if I try to fill more than ~20 histograms from a for loop then it becomes very slow. For example:
for(int i=0;i<nentries;i++){
nu_reco->GetEntry(i);
hist1->Fill(var1);
hist2->Fill(var2);
…
}
Could this be b/c I am using an older root verion - 4.04.2b
-thanks Debdatta.