Evaluate Profile-Guided Optimization (PGO)

### What's wrong?

(not actually a bug but the repository does not have the right issue type. Feel free to change the issue type)

Hi!

Recently I tested a lot of software with PGO and measured the performance improvements from PGO - the results are [here](https://github.com/zamazan4ik/awesome-pgo/). Since my results show interesting improvements on a lot of databases (including PostgreSQL). I think it would be a good idea to measure PGO effects on Hydra PostgreSQL extension as well - e.g. reduce CPU usage in some cases. If the results will show an improvement - would be great to see a note in the documentation about PGO benefits for Hydra.