Why isn't Quarkus 2x faster than Spring on my machine?
Summary
Quarkus vs Spring benchmark on a bare-metal Fedora workstation reveals that local environment factors—specifically rootless container networking with pasta, firewall rules, and a single-threaded userspace proxy—limit Quarkus throughput. The investigation identifies that host networking and reducing firewall overhead can dramatically improve performance, aligning local results with lab benchmarks. The post also provides practical guidance and known issues in rootless container setups.