how do i make my layout not lag

one of the only solutions i can think of is using an import instead of writing style on the actual site because it'll reduce bandwidth and help things load just a bit faster.

If you check out neocities, you can create a css style sheet there and then use this to import it:

<style>

@import url('LINK');

</style>

to get the link hit 'view' on the css sheet and copy the link in the search bar