Description

Recently, we've faced certain performance drops for startup time and after-start memory footprint after Quarkus 3 upgrade. We are not able to continuously compare the performance measures with additional improvements, so an additional analysis of performance is needed.

The outcome of this issue:

• Analyze major performance gaps found in Keycloak
• Propose proper solutions for resolving them
• Aggregate the findings into a single central point (this epic) in order to properly trace them

More details in #20448