It's fantastic that your team is tkaing the time to consider improvements to the user experience. Here are some things I've noticed today. For reference, I'm on a 40 megabit connection and have tested speeds to servers hosted in a number of countries today.
Search Page Load: I've done this multiple times today, and the average page load time is more than a minute. I see a couple of errors in the browser console, but nothing that should cause the slow times. The console is telling me that no individual asset is taking more than about 4.5 ms to download, but there are gaps between requests and responses. Overall, page loads are much slower with the new design.
Computer vs Phone: The new design might be more phone-friendly, but it's the opposite for computer users. In search results, the new design uses a very wide column that holds the description and preview images. This goes across most of the page when the window is wide, such as on a computer. It makes the description text more difficult to read (long lines of text are not easy for human brains) and the mouse makes a long journey left to the right in order to click anything.
The descriptions are also worth talking about. For really longs ones, the text is now in a scrolling region. For computer users who use a mouse and finger-scroll, this catches on those scrolling fields and the page scroll stops in order for the field scroll to continue. This is frustrating and is not how people normally approach a page.
I wonder if it would be possible to have CSS that lays out the page differently for mbile, tablets, laptops, and wide screens? This seems fairly common for websites these days. Could it work for everyone here?