Long running python launched from php exec?

Question

PHP

The script is written in python3, it is run from php with the exec, system, shell_exec function.. It doesn't matter, the problem is that it takes hundreds of times longer than when I run it directly from the terminal.
When launched from the terminal, it takes about 10 seconds, when launched from php, the www-data user, it runs for about half an hour .. I've been fighting for 2 days, I can't understand. Newbie in python. What could be the reason?