systemctl show --property=DefaultTasksMax
>> only 64

>> increase the value, set the value to 1024 in file:
/etc/systemd/system.conf

>> reboot machine


>> the performance was much better afterwards!

see also:
https://www.ibm.com/docs/de/db2/11.5?topic=linux-troubleshooting-tasksmax-set-too-low
https://www.strato.de/faq/server/Wie-kann-ich-Performance-Einschraenkungen-bei-meinem-Server-pruefen/

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