The issue is divided into two main parts:

Database Views Performance
The following views are taking a significant amount of time to load:
TransmissionLink
InvBoard
InvNodeInterface
Performance degradation becomes more noticeable when the database contains a large number of sites and high data volume.
Java/ Processing Logic Performance
The NodeBoard combobox iterates over each interface, which causes additional delays.
This loop significantly impacts performance, especially with large datasets.
Current Status
Some improvements have been implemented.
However, performance is still not optimal.
Further analysis and additional optimizations are required.