Optimizing Video Generation on RTX 3090: Low-Res Generation and Upscaling
cocktailpeanut · x · 2026-08-09
Addressing the long rendering times and poor quality when running large video generation models on an RTX 3090 (24GB VRAM), a developer shared a practical workflow utilizing low-resolution generation followed by upscaling.
- The Problem: Directly generating a 10-second video at 832x608 takes over 4 hours and often produces artifacts in dynamic scenes.
- The Solution: Drop the generation resolution to 320x576 or 480p, use a 4-step LoRA to accelerate the process, and finally upscale the output 3x using tools like FlashVSR.
- Results: Generation time is drastically reduced to between 2 and 12 minutes per clip. While the aesthetic is somewhat gritty, it is highly usable for storytelling.
- Pro Tip: Enabling the First Block Cache (without the turbo LoRA) significantly speeds up generation with negligible impact on quality.
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