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LTX-2.3

LTX-2.3 is the 22B high-resolution pipeline. The optimized path combines kernel fusion, cache, PISA sparse attention, NVFP4, and token pruning.

Speed

Full optimization uses kernel fusion + cache + PISA + NVFP4 + token-prune and reaches 2.40x speedup. Measured on GB200 with 1088x1920, 241 frames, warmup excluded.

Launch

bash scripts/ltx/run_ltx23_sglang_hq_1080p10s.sh baseline
bash scripts/ltx/run_ltx23_sglang_hq_1080p10s.sh fullopt

fullopt is self-contained. Override MODEL_PATH, DISTILLED_LORA, or SPATIAL_UPSAMPLER when weights live outside the default cache location.

Techniques

  • Kernel fusion: kernel fusion reduces DiT operator overhead.
  • Cache: stage-specific reuse avoids redundant work.
  • Sparse attention: PISA targets redundant video self-attention.
  • Quantization: NVFP4 targets video FFN compute.
  • Token pruning: low-salience tokens are removed in selected refine steps.