pgAdmin tool takes a long time to open. After opening the application, it's in loading status. And, it takes more than 30 minutes to complete the loading.
When pgAdmin tool starts, it will run a few big queries against catalog tables to acquire DB information. If catalog tables don't have the correct statistics saved in the DB, those big queries will take a long time to run. Analyzing the catalog tables will help generate the correct statistic for the catalog tables.
Analyze all the catalog tables:
analyzedb -s pg_catalog "dbname"