Issues with historical trends in the Deltag control system

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Recently, a problem with the historical trend data for Deltav has been identified: 1: The computer becomes extremely slow when the historical trend charts for various process stations are displayed. 2: It is very slow when opening historical trend charts on both the engineer station and the PLUS station; sometimes they cannot be opened at all. 2: Sometimes, when the historical trend screen is opened and a time range for viewing is selected (for example, to view the trend over the past half hour), the screen freezes and becomes unresponsive. Current solutions: 1: Restarted the servers of previous stations, but there was no improvement; the lag persisted as before. 2: I also cleared the cached junk data, but there was no improvement; it remained as slow as before. 3: With such lag, even after reinstalling an operation station, the problem persists; the station remains stuck as before. Note: When the historical trend screen was opened, there was lagging, but no error messages or similar alerts appeared. This system has been in use at my factory for over two years, and no such issue has occurred compared to other units that have used the same system for the same period of time.