Hi Walter,
Regarding your questions about the Gantt Chart:
1. The performance will be improved in the next versions. This is a work item for Q2.
2. It is possible to have only 1 task per row. For multiple tasks per row, you can consider our Scheduler component.
3. It is possible to change colors like that: https://www.htmlelements.com/demos/gantt/nonworking-days/
Best regards,
Peter Stoev
Smart UI Team