[Bug]: UI performance regression

[shilman]

Describe the bug

We are seeing a performance regression in Storybook's startup time, possibly due to the new "experimental" components

Here is the time to first render for the React-Vite project over time:

Drilling in, it appears to have been introduced around this commit, potentially somehow due to the new icons? (Pink column is time to preview responsive)

Another clue is that the build size (purple column above) also increased around the same time:

To Reproduce

https://lookerstudio.google.com/u/0/reporting/6a438ac0-fe04-490c-ba91-f12a5bb6e917/page/p_54yskb3a7c

System

No response

Additional context

No response

[shilman]

Digging in more, I think the commit I highlighted above is indeed the culprit. This is me filtering by the branch charles-update-controls-addon that introduced the commit and you can clearly see the bump before and after on this narrowed down view (pink & dark purple columns):

[shilman]

Update: there are two different perf regressions going on here!

1. startup time = d8d8cac
2. preview size = 0005430