For me what seems to kill it is if I'm doing a web search in Spotlight (by typing the full query and hitting the "search web" button. It'll start by trying to suggest results from my phone, but as the string gets longer it seems to just stutter and die, and will simply display no results at all (not even the search web button.) if I just close out of spotlight and come back about a minute later, it will usually sort itself out. It's made a spotlight basically unusable for me, and for years it's been my primary way of opening apps, finding content, searching the web, and otherwise navigating my phone. Now instead of just pulling down, entering my query, and being done, I have to find Safari, open it, create a new tab, go to the address bar, enter my query, and finally I can search. It takes 4 times as long and way way more steps. I miss Spotlight. It's especially grating since they hardly added any new features to Spotlight in this release, yet they still managed to break everything that was already there.