Та если бы только для производительности. Эти т.н. антивирусы ещё активно мешают базе работать, вмешиваясь в действия, выполняемые в PGDATA.

https://wiki.postgresql.org/wiki/Running_&_Installing_PostgreSQL_On_Native_Windows#Antivirus_software
Antivirus software

If you have any antivirus software installed, you must exclude the data directories that are to be used by PostgreSQL and must exclude postgresql.exe process. If that still does not help, it may be required to completely uninstall the antivirus software from the machine.

Antivirus software can interfere with PostgreSQL's operation, because PostgreSQL requires file access commands in Windows to behave exactly as documented by Microsoft, and many antivirus programs contain errors or accidental behavior changes that cause these commands to misbehave subtly. Most programs do not care because they access files in fairly simple ways. Because PostgreSQL is continuously reading from and writing to the same set of files from multiple processes, it tends to trigger programming and design mistakes in antivirus software, particularly problems related to concurrency. Such problems can cause random and unpredictable errors, or even data corruption.

Antivirus software is also likely to dramatically slow down PostgreSQL's operation. For that reason, you should at least exclude postgres.exe and the data directories so the scanner ignores them.

Удалить Касперского, перенастроить Касперского, ничего этого сделать нельзя естественно.
А не сделаете этого - сможете получать разные интереснейшие фейерверки. Единственным ответом на которые будет "разберитесь со своим антивирусом".