Mautic tracking js backend api is taking too much time

Your software
My Mautic version is: 2.15.1
My PHP version is: 7.2
DB: MariaDB
MySQL Ver 15.1 Distrib 10.3.11-MariaDB, for Linux (x86_64) ]

Your problem
My problem is:
mautic tracking js backend api is taking too much time. five seconds time to post event.
so my site is taking 12 seconds to load as i have implemented mautic tracking js code.
https://mautic-server.xxx/mtc/event

These errors are showing in the log:

Steps I have tried to fix the problem:

checked db connection & queries. No slow queries more than 0.2 seconds found

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