As a new S3D user (and generally happy with the product), I sliced a model that contained a bridge for the first time over the weekend. The bridge was over the top of a square hole in a wall (i.e. a 3mm wall has a horizontal 15mm square hole in it). My printer is able to bridge quite long distances (easily handles 15mm), but to do so in ABS requires the bridging layer to be printed very slowly otherwise the extruded plastic usually breaks and curls up, often catching on the nozzle later and ruining the whole print. So I set the bridging parameter to a very slow speed. S3D correctly detected the bridge and used straight slow infill paths over the gap, but failed to change the speed for the perimeters. The perimeters are obviously just as much bridging moves as the infill, and so should conform to the bridging parameters (speed and fan) - but they don't. On my print the infill bridged perfectly but the perimeters broke as I knew they would at full print speed. Therefore this is a bug. I have reported it to S3D support, but wonder if anyone could suggest a workaround until the bug is (hopefully) fixed.
Dave