Strange issue with django

Hi all,

We have a django backend for our application - running with DRF. This has been working perfectly since November last year. Now we have upgraded to django 3.0 and also DRF to the latest version. We also added some DB indexes. After this upgrade we now have certain endpoints that went up to 25 s loading time (from about 5 s). We have reverted most of these changes and gone through our code but still can't find where this issue is.

We even reverted back to django 2.2 and the previous version of DRF which gave us reasonable speed, but it still doesn't work correctly. 

Does anyone have any ideas what the issue might be?

Regards,

Andréas

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