Yes, I agree, thanks for testing on Firefox. I use Zen on a daily basis, it is Firefox based and my result is also interestingly around (0.56ms median, 0.59ms mean, 0.78ms P95, 0.94ms p99, min 0.48ms, max 1.3ms) for prefix bangs. I think that the differences come in how each browser may have implemented SW. On benchmarking suite specifically the tail can also come from scheduling, IPC, extensions, timer precision, or other browser work