The problem of displaying on Mac and IOS

I started creating a new site, but I ran into a couple of problems.
The first problem is how the website looks in the Safari browser. This applies to all Apple devices from the iPhone to the MacBook and iMac. Namely testimonials looks bad. But in the Chrome browser it looks normal. The second problem is with the portfolio. I entered slugs, but it doesn’t work.
And a final problem with the download speed in the Safari browser. The page loads very slowly.

My website:


Please create a separate topic for each of your issues to keep forum in good order and make it easier to help you.

Kind Regards, Roman.