Slow devServer after upgrading to CRA 4.0.0

[kharenzze]

I feel that my devServer is considerably slower (~ x5) after upgrading to CRA 4.0.0. I removed node_modules and reinstalled my deps, but performance was not affected.

[amcsi]

Same. At least with fast-refresh. Getting a change to show used to take ~0.5 seconds, now it takes 3 seconds.

Before I was using CRA 3 with @pmmmwh/react-refresh-webpack-plugin.

[MichaelBurgess]

Likely this? #9886.

I'm hoping they release a patch version with it in soon so I can move to v4.

[always-maap]

same. around 15s every time for small change in almost massive code base

[MichaelBurgess]

I'm still seeing very slow start time with 4.0.1, but the fast refresh time is on par with the previous time needed to reload the page.

CRA v3 would previously start to reload the page a fraction quicker, but the advantage now is that I'm not having to make a load of network requests to bootstrap the site after each code change, so I think the net result is a quicker dev experience.

What are your experiences?

[amcsi]

I don't remember how fast the devServer is supposed to start, but it feels really slow compared to CRA 3.
I do know that fast refresh is equally 6x slow in CRA 4.0.1 and 4.0.0 compared to CRA 3.

So I hardly noticed any improvement in 4.0.1 overall unfortunately.

[Max-Zviagintsev]

Extremely slow start. We also hit memory limit in our CI/CD because of high memory consumption in the build process. Rolling back to 3.4.4

[patricknick]

We had to revert to 4.0.0-next.98, as 4.0.1 was unbearably slow both for startup and refresh (our project is rather large). I've seen some improvements by disabling eslint plugins, but not enough to work with.

[eek]

Extremely slow to start here as well, and also slower than CRA 3 after start. 4.0.1 didn't seem to made any noticeable improvements :'(