The mobile app is and always has been opening and running extremely slow. Is there a way to fix this or leave it open/ accessible for quick access?

I got your back, @KC22. I'm here to help you fix this so you can get back to working order without delay. 

To resolve this, let's first ensure that your device meets the minimum requirements to run the app smoothly. Please visit this article for more details: QuickBooks Online access for mobile devices. 

If this is not the case, let's now clear the cache of your QuickBooks Online (QBO) mobile app. This will eliminate historical data that might cause the slow performance of the program and give you a clean slate. 

Below are the steps you can perform depending on your device:

For Android

1. Tap the menu icon located at the top right corner.
2. Then, select Settings. 
3. Next, click Refresh Data and choose Yes.

For iOS

1. Navigate to the menu button.
2. Then, choose Help & Feedback. 
3. Next, tap Refresh Data and click Refresh.

If the same thing happens, you can uninstall and reinstall the app to refresh the connection. 

In case you experience the same thing while running your account via a web browser, here's a helpful resource that you can check: Why is my QuickBooks Online slow?. 

I've also added this link for further info about QBO mobile app: Compare mobile app features. 

I'm always here ready to lend a hand if you have any other concerns running your QBO mobile app. Have a good one and keep safe.