Emails and notifications are late

I’ve just recently switched to K9. I receive a lot of time-sensitive emails that I normally listen for alerts on my phone for a when they arrive in my inbox. I’m finding I’m not getting those notifications until 30+ minutes later, which ends up being a huge issue. The emails arrive on time to my actual Hotmail and Gmail accounts (from what I’ve seen on the desktop browser), but they’re not arriving into the K9 app until much later. Is there a fix for this?

See How to configure Push?