This document provides some performances analysis of running the end user portal in Pega 8.5.1, Pega 8.6 and Pega 8.8

Constellation UI rendering is 2 to 3 times faster than Cosmos Theme.

Constellation UI has 5 times less transferred resources (Javascript and CSS) than Cosmos Theme and as such is twice faster in parsing the JS and 6 times faster rendering the UI. The page DOM size is also more than 4 times smaller than Cosmos Theme.

By using less Javascript and CSS, having a smaller payload from the server, and a lightweight DOM rendering, the Constellation UI rendering is 2 to 3 times faster on most of the use cases.

The only use case where the load time is similar between Cosmos Theme and Constellation is when creating a case in a modal dialog – because the size of the payload is small compared to other pages, the page load time between the 2 implementations is almost the same. Constellation total load time is slightly higher due to the animation of the modal dialog using opacity.

The attachment documents shows the page load time for different use cases in 8.5.1, 8.6 and 8.8