Hello Spart98,
Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you're having issues with Apple News being slow on your Mac. Is this occurring in the Safari Browser, or in the Mail app itself? We want to make sure we provide the correct guidance.
Try the steps listed here to see if they resolve the issue: If an app on your Mac stops responding, closes unexpectedly, or won’t open - Apple Support
"Quit and reopen the app
Quit the app, then open it again. If the app won't quit, force the app to quit. Then check to see if the problem with the app is fixed.
Restart your Mac
Restart your Mac. Then check to see if the problem with the app is fixed.
Check for updates
To see if updates are available for the app, open the App Store, then click Updates. If updates aren't available for the app, update the software on your Mac. Or if you didn't get the app from the App Store, look for updates to the app on the app developer's website. Then check to see if the problem with the app is fixed.
Reinstall the app
Delete the app. When you do this, you might lose data that was stored in the app. Then redownload the app. If you didn't get the app from the App Store, redownload the app on the app developer's website. Then check to see if the problem with the app is fixed.
Get more help
We hope this helps.
Cheers!