tl;dr: "Riptide is an improvement to WebKit’s collector and retains most of the things that made the old algorithm great. The changes that transformed WebKit’s

tl;dr: "Riptide is an improvement to WebKit’s collector and retains most of the things that made the old algorithm great. The changes that transformed WebKit’s collector were landed over the past six months, starting with the painful work of removing WebKit’s previous use of copying. Riptide combines Guy Steele’s classic retreating wavefront write barrier with a mature sticky-mark-sweep collector and lots of concurrency tricks to get a useful combination of high GC throughput and low GC latency."