Our application was having issues when rendering a list with approximately 150 items. Each item in the list is rendered into a number of columns determined by configuration. The columns range from being a glorified print string, to reasonably complex selection logic and time since presentations.
The performance issues mainly presented themselves when the application would poll for data - which in this case would result in retrieving the full data set for all views in the application. In future we hope to move to a diff based poll or eventing but have not yet had time to implement the backend.