Since .war files are pretty much the unit of deployment for non-EJB based web-apps. Does the size of the .war file affect the run-time performance of the app. Is it scalable to have 100 .war files supported by an app server instance?
If the servlet engine is given enough memory there should be no noticable impact from just the number of applications loaded. Obviously its the rate of requests and related processing load that is going to be significant. Bill