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Question slow cronjob after file size

Matzn

New Pleskian
I run a cronjob to export data in csv files in php 7.3. The job is running fast to a files size about 80MB after this size will very slow. I split the files in many 10MB files and the job running fast till ends.

Where does the delay come from when file size bigger than ~80MB ? System load (memory, cpu, ssd) is low.

System:
Ubuntu 20.04.2 LTS
Plesk Obsidian Web Host Edition
Version 18.0.33
 
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