Filtering within a Test Plan issue has just been made easier. It is now possible to include any issue field (native or custom fields) to filter Tests within a Test Plan issue. JQL searches are also possible as of now.
Of course, the filter values are also saved in user preferences so that users do not lose context when navigating between issues and reports.
As part of our continuous performance improvements, we have enhanced the loading times of the Requirement issue's Test Coverage web panel. We have also improved the Test Repository folder load times.
Improving performance is an ongoing effort, so expect additional enhancements to come ahead.