Hook mount/unmount time depends at number of hooks on page

[andrewsokolov]

For big projects, we have ~ 8000 hooks on the page for multiple stores.
For the biggest store, it's around 4000 on the page.

Mount/unmount each sweet state hook do subscribe/unsubscribe operation on the store.
And implementation of this subscribe/unsubscribe has O(n) complexity, so when need to mount 4000 hooks at once it becomes very painful for UI performance.

Problematic parts highlighted in the screenshot:

Also the video with numbers:

And if we replace js array with Set time of subscribe/unsubscribe close to 0 ms and has O(1) complexity

Mount big view:

Before:

After:

Scroll in virtualized list:

Before:

After:

Unmount big view:

Before:

After:

[albertogasparin]

Great finding!! Let me know if you struggle finding time to raise a PR in the next few days/week 😉