A method for scaling web application execution is claimed. A simulation execution is deployed to server instances to obtain first gathered metrics. The server instances are partitioned into server types based on hardware processing capabilities, and arranged in tiers of computing resources. Server instances of a first selected type form a first selected configuration. A web application is executed, on the first selected configuration, in a web application container to gather the first gathered metrics. When a measured metric fails to meet a baseline, then: a second server type is selected; a second server instance of the second selected type forms a second selected configuration; the web application is executed on the second selected configuration in the web application container to gather second gathered metrics; and an execution model is generated from one of the first gathered metrics and the second gathered metrics.