I have been a developer for 10 years.
I am also an Expert in page speed optimization for Wordpress and Shopify.
--Things to consider for speed--
✔ Critical css
✔ Serve images in next-gen formats
✔ Preload key requests (mostly for fonts I would suggest)
✔ Minify JavaScript and css
✔ Ensure text remains visible with webfont load
✔ efficient cache policy for static assets
✔ Optimizing and Properly sizing images