The "web transaction times" of a large Fortune 2000 customer that upgraded their main website to Acquia Cloud Next. You can see that PHP (blue area), MySQL (dark yellow area) and Memcached (light yellow) became both much faster and less volatile after migrating to Acquia Cloud Next. (The graph is generated by New Relic. New Relic defines the "web transaction time" as the time between when the application receives a HTTP request and when a HTTP response is sent.)
