Profile why day.index is so much slower than day.getIndex() ----------------------------------------------------------- Key: DROOLS-667 URL: https://issues.jboss.org/browse/DROOLS-667 Project: Drools Issue Type: Enhancement Affects Versions: 6.2.0.CR3 Reporter: Geoffrey De Smet Assignee: Mario Fusco day.index is 3 times slower than day.getIndex() (and it's gets more as the dataset grows) As discussed with Mario. Rough benchmark speeds here: https://gist.github.com/ge0ffrey/7662856f357dbec7f7ec Reproduce recipe - git clone optaplanner - Run TravelingTournamentApp, load dataset bra24, solve it for about 30 seconds. - Open travelingTournamentScoreRules.drl. Replace all occurrences of "day.getIndex()" with "day.index". - Run TravelingTournamentApp again, load dataset bra24, solve it for about 30 seconds again. - Compare the last log message of both runs: look for average calculate count per second (x). Higher is faster. For bra24, day.getIndex() is 3 times faster than day.index.