Webpack-dev-server proxy requests very slow

I am using webpack-dev-server proxy:

devServer: {
        proxy: {
            '/api': {
                target: 'http://mybackedn.url',
                changeOrigin: true
            }
        }
    }

Requests take too much time. Chrome network panel shows this:
Why this happens? How to solve this problem?


from Webpack-dev-server proxy requests very slow