Hi Victor, Please provide more information! Do you see this slow down only for a few branches or for any branches, all branches? Could you activate gDebug=2 when reading with 3.03 and 3.05? Could you send the output of file->ShowStreamerInfo(); Rene Brun > Victor Perevoztchikov wrote: > > Dear rooter, > during transition from ROOT 3.03.09 ==> 3.05.04 in STAR experiment > we found that reading of TTree is 2.5 times slower in new version. > Timong > 3.03.09: Real: 38.42 CPU: 36.93 > 3.05.04 Real: 93.94 CPU: 93.21 > DST was produced by ROOT 3.03.09 > Reading a few branches from big TTree > > > Any ideas why? > May be old format is still supported but slowly? > > > Victor > > > Victor M. Perevoztchikov perev@bnl.gov > Brookhaven National Laboratory MS 510A PO Box 5000 Upton NY 11973-5000 > tel office : 631-344-7894; fax 631-344-4206;
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