Structure.Testy and Structure.Pages should have very limited effect on system performance.

Structure.Gantt, because it works with live Jira data and performs a number of calculations, may affect performance and require some additional attention to minimize its impact.

Structure.Gantt

Working With Jira Data

Structure.Gantt uses actual Jira data for visualization of tasks on the timeline. Users can define which custom fields are used for Start and Finish dates, what data is used for task estimation (Jira time tracking info, story points or some other fields) and what Jira link types are used for different types of dependencies.

When a user changes any of these parameters in the Gantt chart (by resizing or moving task bars, adding or removing dependencies, etc.), the user is modifying the corresponding Jira data. While a sandbox mode is planned for the future, currently all the changes are done in real time.

Structure.Gantt Performance

Some operations and configurations may require additional calculations by Structure.Gantt, which could affect performance. While for smaller structures this should't be a problem, for larger projects, these calculations can add up, so it's recommended to try such configurations on a staging server first.

• The Gantt chart visualizes tasks on the timeline, and with certain settings this may require some calculations. For example, you can use Structure formulas for calculating Start/Finish dates, estimates or progress. 
• Visualizing tasks with dependencies may also require certain computational effort. 
• Resource allocation is calculated by Structure.Gantt.
• Resource Leveling  is a resource-intensive operation. See Structure.Gantt 2.0 Release Notes for information about testing and customizing this feature for best performance.

For more information please read the enterprise deployment notes.