Appreciate your kind words here. For context, one of the speed issues we have in the builder is that it takes a rather long time to generated the dynamic styles for each element. On the front end it’s not a big deal because it gets cached on the first render (flushed on each change/save) but this has been more and more notably slow in the preview. Ironically, it was much faster in earlier versions of Cornerstone, but that was before we had to manage responsive styling and also loopers which add a fair amount of overhead.
I did a bit of PHP profiling the other day and was able to get the initial generated CSS to run a fair bit faster. But unfortunately the initial load of the builder is still somewhat slow. I’ll come back to this again later in the cycle once we’ve got all the new features in.
If you have PHP 8 available, it seems to run fastest on that version.