May 2, 2026
VMs: tiny, fast, and very disputed
How fast is a macOS VM, and how small could it be?
Tiny Macs can run a mini Mac inside them, but the comments are fighting about what that really means
TLDR: A new test says a virtual Mac can run surprisingly well even with very modest memory and processor limits, making small Apple laptops look more capable than expected. But commenters are split between impressed and skeptical, with many saying real-life app use, graphics work, and coding tools are a lot messier than the benchmarks suggest.
Apple fans just got a fresh excuse to argue online: how tiny can a virtual Mac get before it turns into a sad, spinning beach ball? According to the latest test, the answer is: smaller than a lot of people expected. On a powerful Mac mini, a virtual version of macOS ran at almost full speed for everyday stuff, and even a stripped-down setup with just 2 virtual cores and 4 GB of memory was described as thoroughly usable for light tasks. Translation for normal people: yes, you can run a second Mac inside your Mac, and it’s not nearly as sluggish as the skeptics feared.
But the real show was in the comments, where the crowd instantly split into camps. One side treated the results like a victory lap for tiny Macs, with a “see, told you it could work” energy. Another side was deeply unconvinced, pointing out that a system using 5 GB at startup isn’t the same thing as surviving once you actually open apps. That sparked the classic internet argument: is this a real-world success story, or just benchmark theater?
Then came the grumbling from users who’ve already wrestled with Mac virtual machines in the wild. One called the experience “painful and inefficient (but usable),” which is basically the unofficial slogan of half of modern computing. Another newcomer to Mac land complained it feels nearly impossible to get the holy trinity of PyTorch, GPU acceleration, and VM-style isolation all working together. In other words: the benchmarks look neat, but the community is yelling, “Cool chart — now make it useful.”
Key Points
- •On a Mac mini M4 Pro running macOS 26.4.1, a macOS VM with 5 virtual cores and 16 GB RAM achieved about 98% of host single-core CPU performance and about 95% of host GPU Metal performance.
- •The article reports weaker virtual neural engine performance than the host, especially in half-precision and quantized CoreML tests.
- •Using the Viable virtualizer, the author found that a macOS VM remained usable for light everyday tasks even when reduced to 2 virtual cores and 4 GB of memory.
- •The article recommends avoiding macOS VM disk sizes significantly below 50 GB because updates may fail, and suggests at least 60 GB for safer use.
- •Because APFS stores VMs as sparse files, a 100 GB macOS VM may initially occupy only about 54 GB on disk, making it more practical on systems with limited SSD space.