August 5, 2026
Emulation? Recompilation? Fight!
Pushing the limits of RISC-V emulation
This chip-speed experiment wowed nerds, but the comments turned into a naming war
TLDR: The article shows how a RISC-V virtual machine can get much closer to normal computer speed by cutting out extra work during execution. Commenters immediately turned it into a debate over whether this is a true emulation breakthrough or just a clever rebranding of old recompiling ideas.
A deep dive into making RISC-V programs run way faster on non-RISC-V machines somehow turned into the internet’s favorite side quest: arguing over what to call it. The article itself is ambitious stuff. The team behind OpenVM wants to run a program, then generate a cryptographic proof that it ran correctly. That proof-making step can be spread across lots of hardware, but the actual running of the program happens one step at a time, so it’s become the big slowdown. The author’s big trick is cutting out layers of overhead so the virtual machine gets much closer to native speed.
But the comment section? Absolutely locked onto the vibes. One camp was impressed by the engineering, while another basically shrugged and said, “Congrats, you reinvented recompiling.” Dmitrygr delivered the killer line, saying it’s “not emulation but static recompilation,” which is the kind of nitpick that launches a thousand replies. Another commenter was even less dazzled by the speed gap drama, saying getting only a fraction of normal speed from basic emulation has been standard for decades. In other words: some readers saw a breakthrough, others saw a very fancy version of known tricks.
The funniest energy came from the old-head computer crowd reminiscing about weird “poor man’s JIT” hacks and asking why operating systems don’t just ship apps in a universal format and translate them later. So yes, the article was about performance — but the real show was the community split between “this is cool”, “this is old news”, and “we solved this in 1997, kids.”
Key Points
- •The article focuses on improving execution speed in OpenVM, a RISC-V virtual machine that also produces succinct cryptographic proofs of correct execution.
- •Axiom has scaled proof generation from a single CPU to clusters of GPUs, but program execution remains sequential and has become a bottleneck.
- •On an M3 MacBook, a native arm64 build of the same program ran in about 100 milliseconds, versus roughly three to four seconds through OpenVM’s interpreter.
- •The baseline implementation described is a classic interpreter that repeatedly fetches, decodes, and dispatches each RISC-V instruction.
- •The post argues that fixed interpreter overhead can exceed the useful work of small guest instructions, motivating translation techniques such as ahead-of-time recompilation.