Need feedback on my website design

Hey everyone! It’s my first time creating my own website from scratch and not using a WordPress template etc.. I’d like to see what you think and I would be very grateful for any feedback. My website: earthflightmedia.com One of my biggest concerns is optimization: On my iPhone the website is smooth, but when I tried it out on a Google Pixel it became quite laggy. I’ve also noticed that it doesn’t run smoothly on Firefox. I’m not sure why this is the case as other browsers are fine for me. Could you