When switching files, there’s an option “Go back” one level and see the list of workspaces instead. This list is currently very slow to render when there are many workspaces. The same is true for the list of files on the current workspace. This becomes especially a problem when the repository contains a lot of “non-model” files. The performance of this component should be improved to be fast independent of the number of files and workspaces. `kogito-examples` is a very good repository to use as a parameter. 

Evaluate and replace if works the default list of PatternFly with

 https://github.com/bvaughn/react-window or https://github.com/bvaughn/react-virtualized.