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Similar to Quasar then I assume. I'm sure native fibers would be faster, but bytecode is fairly close to ASM and i don't think the performance difference is large.

Benchmarks I've seen for Quasar show no performance difference to regular threads at low paralellism but it can scale much higher

Found a great article comparing Akka's Actors vs Quasar http://blog.paralleluniverse.co/2015/05/21/quasar-vs-akka/

Not only that, its non blocking. Meaning you can have a very small thread pool with great performance. Think 1 thread per core.

Quasar is Loom. Hopefully pron chimes in.

Loom is quite a bit different than Quasar, but pron (aka Ron Pressler), is leading the way on both. Loom is essentially Quasar would have loved to have baked into the JVM. It's the solution for the bytecode rewriting hackery and resulting limitations it faced.