It's not impossible; you could e.g. profile a real client's timing and introduce delays into the headless version. It's not zero work, but it's very much not im

It's not impossible; you could e.g. profile a real client's timing and introduce delays into the headless version. It's not zero work, but it's very much not impossible if you're sufficiently motivated. Especially recently with e.g. https://hackaday.com/2018/01/06/lowering-javascript-timer-resolution-thwarts-meltdown-and-spectre/ https://hackaday.com/2018/01/06/lowering-javascript-timer-re... , high-precision timers in JS might not be available for all clients for reasons other than ~"they're headless and trying to scrape my site".