I ran a quick google page speed insights. Looks like they think it runs okay. I also run it behind a reverse nginx proxy with gzip and 304 not modified etc enabled.
Page speed is important for SEO because Google ranks pages more highly if they load faster and work better on mobile devices and so on. They’re pushing PWA (progressive web apps), so they may even rank sites running service workers more highly. The more optimizations the better. Meta tags for description and keywords is important, and so is opengraph tags for things like facebook, twitter, discord, rocket chat, and any other chat/posting program that reads opengraph meta tags for website previews.
Apart from the minification options in the webpack config, I also run all of the images through compressor.io when I save them, to improve speed.