It works on Firefox Focus as well. No lag or 30secs wait. Maybe it's the internet? Wait, am using Android. You said safari - 30+ secs. Do you use iPhone as well? Then it could be safari browser engine's issue.
I check by curl the JS, It looks like this tries to load a massive amount of GPU code, badly ("WARNING: Multiple instances of Three.js being imported.") to provide background animations after downloading 3MB of scripts.
I test in Chrome on Mac; Sometimes when I reload there are Three.js conflicts, like if one loads before another and clobbers it, sometimes it works but rarely.
Runs nicely on my M4 Max Mac Studio - which, going by the PassMark numbers, is about the same speed as an iPhone 17. Testament, I think, to how well this site is optimised for the sort of underpowered device, hopelessly inadequate for modern workflows, that many sites would not bother to cater for.
After getting to the point where vibe coded slop is getting pushed to production it's not clear to me if a future where AI can replace me is a worse future than we have now.