Django performances issue

I have developed the API using DRF but facing the major performances issue.

Here is what the scenario is: I am using DRF. Our API call is growing towards 5k per day. Each API call is taking 3 to 10 minutes of time while responding ( as It creates upto 300 pdf label unique format)

I am using uwsgi( many worker) now with the Apache.

We have implemented the caching but not able improve very much performances level.

Primary query:

Shall we use gunicorn instead of uwsgi? What about message/ job queue? Is this work.

My current server RAM is only 32 GB. Shall I have to increase this if yes how much ( we personal don't want to go for vertical scaling)

Please suggest the approach, first time I am handling such level of performance issue.

I am very optimistic about message/ job queue and gunicorn.

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