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TTS Bench — Speed — 2026-05-25_0037

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

Label: patch · default voice · fixed + MOSS

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: F5-TTS v1 (cuda) — 5.32× warm RTFx, 845ms warm TTFA

Model	Device	TTFA cold	TTFA warm	RTFx cold	RTFx warm	Peak RAM	Peak VRAM	Size	Released
F5-TTS v1	cuda	1.31s	845ms	3.47×	5.32×	2.67 GB	802 MB	330M	Oct 2024
MOSS-TTS-Nano	cuda	5.83s	4.92s	1.36×	1.61×	2.42 GB	777 MB	100M	Apr 2026
MOSS-TTS v1.0	cuda	5.23s	4.74s	1.34×	1.48×	2.08 GB	22.83 GB	8B	Feb 2026
IndexTTS-2	cpu	6.48s	5.42s	1.09×	1.31×	5.56 GB	—	1.5B	Jun 2025
MOSS-TTS-Nano	cpu	6.38s	5.64s	1.08×	1.21×	3.14 GB	—	100M	Apr 2026
IndexTTS-2	cuda	7.20s	6.03s	0.93×	1.11×	5.88 GB	7.60 GB	1.5B	Jun 2025
F5-TTS v1	cpu	58.77s	60.21s	0.07×	0.07×	2.59 GB	—	330M	Oct 2024