(var == $v) is faster than ($v == var) and scales much better: can they both be that fast? ------------------------------------------------------------------------------------------ Key: DROOLS-1519 URL: https://issues.redhat.com/browse/DROOLS-1519 Project: Drools Issue Type: Enhancement Components: core engine Affects Versions: 6.5.0.Final Reporter: Geoffrey De Smet Assignee: Toshiya Kobayashi Priority: Critical Fix For: 7.35.0.Final See: http://stackoverflow.com/questions/43282665/why-does-the-order-of-how-we-... The ($v == var) filters much later causing a scaling loss. Investigate if drools can avoid that problem and make the slow one as fast as the fast one. We don't want to have to rewrite all our rules to take advantage of this speedup and educate all our users to prefer one way over another, if and only if we can avoid it.