They seem to be measuring things like how long it takes for the dev server to spin up, and how long HMR updates take. I don't think ESBuild offers these feature

They seem to be measuring things like how long it takes for the dev server to spin up, and how long HMR updates take. I don't think ESBuild offers these features out of the box. I guess it could be in the "Cold build" chart. AFAIK Vite uses ESBuild at least for some of its building, though. node_modules, dev builds maybe. Not sure if it was used in this benchmark or not.