My World feels so laggy even though it's only ~3mb

This is my world
I do all the modeling and texturing in Blender and tried optimize things as much as possible and then export it to .glb file with no compression.
I haven’t do any coding but the app is already quite laggy. I think that I’m doing something wrong because I feel like it shouldn’t be this rough, or I used too much poly?
Can someone help me to boost performance of this model

No laggs. About 60 FPS

Oh, sorry, I forgot that my browser’s not having hardware accelerated. Jump to Firefox now and it’s smooth as ever