1441785 - Improve performance of VisibilityHelper

Status: NEW

(DevTools :: Framework, enhancement, P2)

Description

[Jan Honza Odvarko [:Honza] (always need-info? me)]

This is a follow up for bug 1419350

Visibility helper is nicely improving the performance by avoiding useless re-rendering if a panel is running in background.

But, React is still spending significant time when state changes. It would be great if we could disconnect components from Redux store temporarily and safe even more CPU cycles.

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From this comment:
https://bugzilla.mozilla.org/show_bug.cgi?id=1419350#c26

The vast majority of react.js is delegated to react-dom.js:enqueueSetState 
By looking at the stacks, it looks like it is only to update the VisibilityHandler component.
We can see its shouldComponentUpdate method being called.
Then comes reselect and all the filter function, we spend 34ms in them.

Honza