Why does React take a long time to reload?

Question

React

I start React: yarn start
Everything is OK in the process of work: I make changes, the components are updated, I see updates in the browser.
But over time, the reassembly starts to take a very long time, it just hangs: Compiling...
And you have to wait a long time for updates.

I found this command to fix: echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
But no result. The project is simple. Who knows what's wrong? Big projects are ok.
Restarting the OS helps.