Hello liz.apple,
We see you're having some issues opening the Apple News app. To clarify, you're saying that the app takes a long time to open, correct? We want to verify if that's the issue, or if the app is opening but content is slow to load.
Also, are you having similar issues with any other apps?
To troubleshoot, we recommend starting by booting your Mac into safe mode. That runs a quick repair and then prevents items from loading on startup so it will help you rule out some possible causes. Here's How to use safe mode on your Mac.
Once you boot up in safe mode, test Apple News and any other affected apps. Then click Apple menu () > Restart to get back to normal and check out the link above for steps you can take based on the results.
Best wishes.