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TTS Bench — Speed — 2026-06-14_1322

Rig: windows-5090 — AMD Ryzen 9 9950X3D 16-Core Processor (16C) · NVIDIA GeForce RTX 5090 32GB · 126 GB RAM · Windows 11

Label: default voice · longcat_1b,longcat_3p5b

TTFA = time to first audio (ms; lower is better). RTFx = realtime speed (× realtime; higher is better; e.g. 10× means 10 sec of audio generated per 1 sec of compute). Cold = first run after process start; warm = subsequent runs.

Speed winners

Fastest predefined-voice: no data

Fastest cloning-capable: LongCat-AudioDiT 1B (cuda) — 6.69× warm RTFx, 1.19s warm TTFA

Model	Device	TTFA cold	TTFA warm	RTFx cold	RTFx warm	Peak RAM	Peak VRAM	Size	Released
LongCat-AudioDiT 1B	cuda	1.76s	1.19s	5.10×	6.69×	2.22 GB	5.71 GB	1.42B	Mar 2026
LongCat-AudioDiT 3.5B	cuda	2.27s	1.80s	3.41×	4.24×	2.22 GB	14.96 GB	3.83B	Mar 2026