Methods for optimizing webpage content by micro-bucket testing user customization to the webpage include presenting a plurality of modules at a webpage based on a request from a user. The modules define an intent of the webpage. A change defining customization to one or more modules within the webpage is detected. A test case representing the change is automatically generated. The generated test case is a modified webpage having the customization. The webpage is presented to a first segment of users as a control page and the modified webpage is presented to a second segment of users in response to a request for the webpage. User interaction by the first and segment of users is monitored at the webpage and the modified webpage to determine website metrics of the corresponding webpages. The website metrics is used in defining a new control page of the webpage from the modified webpage or retaining the webpage as the control page.