we have noticed a severe decrease in performance reading pg_catalog.pg_settings table in PostgreSQL 12 on MS Windows 10 machines compared to earlier versions.
```
explain (analyze, buffers, timing) SELECT * from pg_catalog.pg_settings where name = 'standard_conforming_strings';
```
On PostgreSQL 12.5, compiled by Visual C++ build 1914, 64-bit:
Function Scan on pg_show_all_settings a (cost=0.00..12.50 rows=5 width=485) (actual time=343.350..343.356 rows=1 loops=1) Filter: (name = 'standard_conforming_strings'::text) Rows Removed by Filter: 313 Planning Time: 0.079 ms Execution Time: 343.397 ms
You can try 12.8 which is available now, there is a dll related fix that can make some improvement.
