Extreme Optimization Issues

Hi I'm working on https://starmi.com/ and I'm having terrible loading issues.

Earlier I was having image breaking issues that looked like this, but deactivated DiviTorque as I thought this was my issue because in the debugging process. This was the plug-in that when deactivated, always made the pictures come back.


However, now I'm having ridiculously slow loading times.

I have one very large image on my main page that seems to be loading the slowest, but if I crop the photo or optimize it I have sizing issues on ultrawide screen monitors (21:9) and since that picture is a staple, I don't want to undercut the quality. But the other pages (ex: vision, team, careers) are also having intense loading issues also, and the pictures on those pages aren't even as graphically intense.

Here is a list of current plug-ins we have that might be having issues:
Divi Toolbox
Supreme Modules Lite - Divi Theme, Extra Theme, and Divi Builder
Webcraftic Clearfy - Wordpress optimization
Wordfence Security
WPS Hide Login
Yoast SEO

Can anyone recommend something that might help optimize the website and picture loading times? Especially in regard to a picture that needs to be high-quality, but work on browser sizes from small aspect ratios to sizes like 21:9?