Copy this to your devtools console to get over 300 WPM in 10fast fingers

10fastfingers.js

function work() {
    document.getElementById('inputfield').value = document.querySelector('span.highlight').innerText + ' ';
    setTimeout(() => document.getElementById('inputfield').dispatchEvent(new KeyboardEvent('keyup', { which: '32', keyCode: '32' })))
}
const interval = setInterval(work, 200);
setTimeout(() => clearInterval(interval), 1000 * 60);