The "Developer Activity" section has an image specific to the user, an image that shows the users activity for the duration of the project. This information should also be shown under the users profile.
The data that generates this file could create a new graph that has a similar format to the "Activity by Clock Time" graphs as to make it clearer. The current graphs work well because they sit side-by-side with other developers so must be compact but in the users profile it could be larger.
But in the very least, the exact graph/image could be shown in the users profile.