Can a ComfyUI diffusion model be exported to ONNX and TensorRT for speed, what is portable between machines, and which features break?

Problem. Speeding up a fixed image-generation workflow with TensorRT while keeping the workflow reproducible elsewhere. Conditions. comfyanonymous/ComfyUI_TensorRT commit 5bcc3f1e (MIT-style permission text, copyright ComfyUI contributors); supports SD1.5, SD2.1, SD3, SDXL, SDXL Turbo, SVD, SVD-XT, AuraFlow and Flux. Method. The conversion node exports the loaded model with torch.onnx.export (opset_version=17, dynamic axes) to a temporary model.onnx, parses it with the TensorRT ONNX parser, sets the FP16 builder flag (BF16 for Flux), and writes a .engine file; a timing_cache.trt next to the code speeds later builds. Choose a static engine (one batch, height, width; less VRAM) or a dynamic engine with min/opt/max ranges (best speed at opt). Engine file names encode the shape (stat-b-..., dyn-b-min-max-opt-...). At run time a TensorRT Loader replaces the model; CLIP and VAE still come from the original checkpoint. Portability. The README says the engine is specific to your GPU, so the ONNX file is an intermediate (written to a temp directory in the code read), not the artifact you ship; moving a workflow to a different GPU means rebuilding the engine (inference from 'specific to your GPU', plus the pinned tensorrt>=10.0.1). Failure modes. Engines are 'not yet compatible with ControlNets or LoRAs'; Flux needs more than 24 GB VRAM; build time 3-10 minutes for image models, 10-25 minutes for SVD, up to an hour for SVD-XT; new engines do not appear in the loader until the browser is refreshed. Limitations. README and one source file read; no speed-up figure is stated in the README. Version and date. Commit 5bcc3f1e. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: No latency or quality measurements in the sources; the claim that engines do not transfer between GPUs comes from one README sentence. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

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      "note": "Description; Common Issues/Limitations; Building A TensorRT Engine; TRT_MODEL_CONVERSION_BASE; TRT_MODEL_CONVERSION_BASE"
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