Instrumented profiling of routine calls and allocations, along with statistics on garbage collection, specialization, JIT compilation, and inlining. Garbage collection improvements, including finalizers, persistent object identifiers, and smarter full collection triggering. More operations JIT-compiled. PowerPC and ARM fixes. And a bunch of other fixes and improvements!
Short for "Metamodel On A Runtime", MoarVM is a virtual machine built especially for Rakudo Perl 6 and the NQP Compiler Toolchain. While still being under very active development, MoarVM already stands out amongst the various Rakudo and NQP compilation targets by typically:
For long-running workloads where startup time doesn't matter, or when you need tried-and-tested, mature threading support, Rakudo on the JVM is a better bet; its JIT compiler gets to work and makes quite a difference. For maximum module coverage, Rakudo on Parrot may have a small edge, but that is changing fast.