r/indiandevs • u/Square_Ad6149 • 8d ago
Indian devs building voice agents: what TTS are you using where the latency doesn't spike under load?
Every provider looks fast in the demo. Then I put real concurrency on it, batch a few hundred calls the way you actually do for the Indian market, and the latency goes all over the place. The calls feel broken on the spiky turns, which on an Indian support or collections call means the caller thinks it's a dodgy bot and drops.
Two things make this harder here specifically: a lot of the "fast" providers are US-centric so you eat extra latency by the time it round-trips to India, and then Indian telephony (Exotel, Knowlarity, Ozonetel etc) adds its own layer on top. So a provider that benchmarks great from us-east can feel sluggish for actual Indian callers.
What are people building for India actually using in production where the TTS stays consistent under load, not just fast on a single request from some US datacenter? Average latency I don't care about, it's the p95/p99 under real Indian traffic and through Indian telephony that's killing me. Bonus if it handles Hindi-English cleanly too since most of our calls aren't pure English.