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Tested with a release binary and Swiss OSM roads in PostGIS at several zoom levels (the higher, the less features), values in ms (average over at least 100 queries): Level | Before | After | % improvement ------------------------------------------- 7 | 37 | 36 | 2.7 6 | 41 | 38 | 7.32 5 | 48 | 46 | 4.17 4 | 70 | 64 | 8.57 3 | 114 | 109 | 4.39 Not much improvement (I'm quite dispointed, here), but not much change in the code.