Performance is a continual journey. With all new features we consider the performance impact on the plugin and carry out series of tests.
The reason for this post is that we've had a few breakthroughs over the last 2 releases and have made a number of improvements to the plugin to the Issue view and Features page improving load times on average by 40%.
The plugin performance is a key component that we will continue to develop. If you have any specific feedback on performance then please get in contact with us.
If you would like a free demo or trial then please get in contact with us at <firstname.lastname@example.org> or a Try it for free - AssertThat BDD & Cucumber for Jira.