Google Performance low on my webflow site

Hi guys

I’m getting a lot of Google Search Console warnings about low LCP, TTFB and some other values. I’m keen on fixing it as it’s downgrading my visibility in Google’s search results.

Now I’ve tried many things. I tried Asyncing certain Javascript files, I tried deferring scripts. But all of these solutions didn’t work.

Now today I checked in Google Inspect and did a testrun. I see that a lot of time is spend by the browsers being ‘idle’. Anyone has a clue as to what this means?