looks like i’m not able anymore to download the project build, my question is: is Launch (Local) a equivalent in perfomance to the downloaded version ?
Launch (Local) changes the way the application looks for script files. Instead of loading scripts from https://playcanvas.com, it tries to load them from http://localhost:51000/ So you need to be running a local web-server on that port to serve scripts from your local machine.
Note, that this feature is no longer supported with the new “Scripts 2.0” and only available in projects using the legacy scripting system.