Messed up homepage and sluggish loading speed

Hello everyone, hope all is well!

I have had a problem with my site for a while. I am obviously using the iconic one pro theme, however, my homepage seems to look scrambled as opposed to organized. Sometimes it looks fine, but it’s usually very messy and unorganized which is obviously not a professional or convenient look for visitors. Additionally, my website seems to load quite slowly. I have inspected everything on my end, but I am not sure if it could be caused because of the theme. What should I do?

Oh and even if the homepage looks fine on a certain browser, it doesn’t look the same way on other browsers!