One of the things we always wanted to handle in OctoPerf is modular design. In JMeter you can use test fragments. So far when you imported fragments in OctoPerf their content was just duplicated over the original Include controller or Module controller.
But now not only can you import your modular design from JMeter but you can also create it directly in OctoPerf:
A fragment virtual user can be seen as a library of functions. At the moment it is only possible to populate it by copy/pasting content but more options will come later.
Then inside any other virtual user of your project you can create a Link action: You can use this to zoom on the fragment itself. That can be useful for instance to see what's the result of a virtual user validation on a test fragment.