Same problem here. And I have a specific example for you.
Go to https://www.xome.com/Listing/ListingSearch.aspx and Inspect any element on the page. It takes several seconds to get to the correct node.
For issues with stepping through code, search sources for displayPins function - you should be able to find it in BingMapv8Wrapper.js (it lists it twice for whatever reason). Place a breakpoint on the first line of the function. Go back to the page, switch to Map view (by clicking on the Map link in top left part of the page). Move the map around to cause it to breakpoint. It takes 2-3 seconds or so for every line - very painful.
I get that the page contains a metric ton of js - but lots of things these days do.