JavaScript Cache Api common timings (SpiderMonkey/Firefox) Operation Time caches.keys() 0.15 - 0.3ms caches.has() 0.25 - 0.5ms caches.open() 0.2 - 0.35ms caches.open() miss 0.25 - 0.5ms caches.delete() free cache.match() miss 0.2 - 0.3ms cache.match() 39 - 40ms (regardless of response size)