TTS Caching

TTS caching is the performance optimisation technique in which commonly used synthesised speech audio clips — greetings, brand names, standard instructions, frequent confirmation messages — are pre-generated and stored for instant playback without requiring a real-time TTS API call. Because TTS generation introduces latency (typically 100–500 milliseconds per request), caching frequently used phrases eliminates that delay for predictable utterances, resulting in faster and more natural voice interactions. Caching is especially valuable in high-volume deployments where small latency improvements across millions of interactions accumulate into significant cost and quality gains. NiCE Cognigy Voice Gateway supports configurable TTS caching strategies.

For enterprise teams, TTS Caching matters because real-world outcomes depend on how the capability is integrated, governed, and measured — not just on the underlying technology. Because TTS generation introduces latency (typically 100–500 milliseconds per request), caching frequently used phrases eliminates that delay for predictable utterances, resulting in faster and more natural voice interactions.

Key Points

• Pre-generates and stores common TTS audio clips for instant, latency-free playback
• Eliminates 100–500ms TTS generation delay for predictable, frequently used phrases
• Results in noticeably faster, more natural-feeling voice interactions at scale
• Particularly valuable in high-volume deployments where latency savings compound
• Configurable caching strategies supported natively in NiCE Cognigy Voice Gateway