All functions in the Plesk Control panel take a long time to complete. But the resource usage on the server is normal.
Debug mode is enabled in
C:\Program Files (x86)\Parallels\Plesk\admin\conf\panel.ini.
Please make sure that debug mode should be disabled in panel.ini file. Make sure that enabled = on is started with semicolon as below. It means that Plesk debug mode is disabled:
; Enable debug mode (do not use in production environment) ;enabled = on [log] ; Log messages verbosity level (from 0 to 7) ; 0 - only critical errors, 7 - all including debug messages, default - 3 ;filter.priority = 7 ; Enable logging of SQL queries ;show.sql_query = on
When Plesk debug mode is enabled, system writes every request (to database/Plesk panel) in log file and it can slow down operations in Plesk panel.