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Rather rough sketch of using requestIdleCallback to break up JS execution
function idle(action) {
return new Promise((resolve, reject) => {
requestIdleCallback(timing => resolve(action(timing)));
async function init() {
await idle(lessImportant);
await idle(nonCritical);
function criticalPath() {
console.log('lots of important stuff');
function lessImportant() {
console.log('less important stuff');
function nonCritical() {
console.log('non-important stuff');
window.addEventListener('load', init);
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