(Google)-Crawling best practice

Since google seems to not supporting the “ajax carwling scheme” anymore, I have trouble get my site craweled.
The bot seems to not wait till vaadin finished rendering so, only the waiting animation get indexed - expect on the start page…

Is there a way to tell the crawlers to wait unit vaadin is fished, or is the way deliver the pre-renderd content based on the user agent? Or does someone have another idea?

Best wishes