Significant performance impact with v6

[quentez]

We've been trying to move to version 6 a few times since it first came out, but we always end up reverting because of its performance impact. Our average JS compute time when going from one page to the next is almost double with v6 what it was with v5.

Any idea what could be the reason for this?

[cvanem]

@quentez I recently updated to version 6 and have not noticed any slow down on a fairly large React application with 25+ routes. How much compute time are you talking about? I typically don't see anything larger than a few milliseconds when switching routes, unless there is a lot of processing involved elsewhere.

[nicoburns]

This will almost certainly be due to a performance regression in react-redux version 6.
See: reduxjs/react-redux#1164