\COPY command and indexes in tables

Hello,

We load large tables in some customer installation (some millions of rows)
from file with:

    TRUNCATE TABLE tableName ;
    \COPY tableName FROM 'fileName' WITH ( DELIMITER '|' )

and got to know that the loading nearly stops (without any real CPU
consumption) in the middle. The wild guess is that we forgot to DROP the indexes on
the tables. The doc https://www.postgresql.org/docs/13/sql-copy.html
does not give any hints related indexes.

There seems to be even tools available which address this issue on the
flight, like https://www.californiacivicdata.org/2018/01/25/index-drop-and-copy/

Any comments on this?

    matthias

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