Why is payroll is very slow in uploading( if at all) in some client files

Hi nealeb,

Thanks for posting in the Community!

There was a reported product investigation yesterday about Unable to Create Pay Run in QuickBooks Online Payroll due to a new update rolled out and the system wasn't receiving enough bandwidth. I'm glad to inform you that the incident is resolved, and we should be able to create pay runs in QBO now.

If you still experience slowness in your payroll account, let's use a different browser or new incognito window. And last is to clear cache and cookies on your browser.

You can also check any reported outages in QuickBooks Online through this link https://status.quickbooks.intuit.com/.

Feel free to post again in the Community if you have further concerns or questions. I'll be around to  help you.