Illustration of three lanes, an event loop ring, a row of workers and a cloud of virtual threads, all narrowing into the same small gate labelled pool

Inside the Quarkus reactive core, part 4: reactive or virtual threads in Quarkus 4

Benchmark the three models the quick way and virtual threads look twice as fast as workers, reactive four times. That table measures the load generator. Part four of the series: how Quarkus 4 runs virtual threads, which pool limits each model, and an open-model benchmark where the worker pool turns out to be a bulkhead.

November 8, 2026 · 23 min · Matheus Oliveira