Hello!
My name is Stas. I can help you with squarespace site. I'm focused on this site building platform. Know how to do a lot of stuff there. I built sites, implemented different design and structural features. Also I worked with squarespace initial code, so I'm able to edit templates if you need. I checked your site. So
1. I thinks this is because you've loaded big size images. There is no need in it because image on site is takes small space (not the whole monitor). Maybe you have some unnecessary custom code that slows loading process. 2. Do you use Stripe at this moment? I can add paypal payment but it won't be as good as stripe in terms of products page connection and order management. 3. I will do it. 4. Thats not a problem.
Also I can edit a little bit your gallery cause it doesn't look aligned. Chat with me so I can show you what I'm talking about.
Let's define milestones after discussion.
Hope I will be useful!
Thanks
Stas