Can an RTX 5090 generate a 15-second MiniMax H3 video in around 1 minute?

Hey, I’m trying to find a cheaper and faster workflow for MiniMax H3 text-to-video with native audio.

My current setup:

* RunPod L40S 48GB * ComfyUI * LightX2V MiniMax H3 Turbo 4-step v1.2 * 1184×672 resolution, around 0.8MP * 15 seconds at 24 fps * Text-to-video with native audio * Video shift 6, audio shift 3 * Euler sampler, simple scheduler

One 15-second video currently takes around 8 minutes. The quality is good, but it becomes too slow and expensive when generating a longer video with many scenes.

Has anyone tested this on an RTX 5090 with 32GB VRAM?

Is it possible to generate the same 15-second, 0.8MP video in around 1 minute without lowering the quality? I’m fine with using FP8, offloading, LightX2V’s own inference framework instead of ComfyUI, or another optimized workflow.

If you have tested something similar, could you share:

* Generation time * Resolution and video length * Workflow or inference framework * VRAM and system RAM usage * Whether native audio was enabled * Any useful settings or links

I’m mainly trying to find the lowest cost per finished clip without dropping the resolution or making the output noticeably worse.