I have had 2 clients complain of slowness with 2018. One is running 2018 Advanced in a data center - server with the RD server in the same data center. Sage is fast running on the server. Clients get a published app and it can take 10 to 15 seconds to load screens, and printing is slow. I have tried the 'spawn from server' and 'slow connection' settings in user maintenance that may have made it a tiny bit faster. NO antivirus on the server or RD server at this time for troubleshooting according to IT. I ask them to make exclusions - they uninstall it!
Second client is 2018 standard and reporting slowness in payroll only. It's again not slow on the server, but just on her workstation in payroll, AP not affected. Their IT has uninstalled all antivirus on server and workstation and still slow. Called Sage and they said it was 'something environmental', no one has reported any slowness with payroll 2018. So zero help there. I threw it back on their IT last week saying I had no more ideas.
I encourage anyone experiencing slowing with 2018 payroll to call Sage and make a case so they can look in to it.