Hey, I'm running on a file which is filtered for two reconstructed tracks (latest snapshot): http://www.slac.stanford.edu/~phansson/files/temp/hps_001353.evio.1_twotrkfilt.slcio When I run the steering/LCIOEventFilter.lcsim over this file on my mac laptop I see a very slow event processing rate ~100Hz. All this is doing is checking for the existence of the track collection, and if its there cut on the nr of tracks and write the event. I checked and it doesn't matter if I write the event or not, still very slow. What speed do you see for this kind of operation? Any ideas why it's so slow? /pelle ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1