The measurement methodology seems a bit odd for the purposes of measuring the difference between old and new computers: if a large fraction of the latency measured is due to the key travel, that's latency which is also present in the older computers (AFAICT buckling spring has a lot more key travel before activation than the scissor-switch keys of the apple and most laptop keyboards) Surely for the purposes of the comparison you would want to look at switch activation-to-bus-activity latency.