I changed the webapplication service (in the services.msc) from "automatic start" to "manual start". You can still run apps from the sutdio without problem. If I want to test something I just start the WebApp service and start testing.
Another advantage: WebApps often open (and sometimes) lock tables and log files, etc. which messes with version control or database changes, etc. And if you have multiple versions of DataFlex installed and forget to remove your old WebApps it would REALLY slow your machine down. Imagine 4 oder 5 WebApps in all the versions from 17.0 to 19.0