Three months running Latentsync on 8GB locally: the real cost of "free"

cloudybrain07 · reddit · 2026-09-01

After three months running Latentsync locally on 8GB VRAM, the author costed what nobody else had — and "free" is doing a lot of work in that sentence.

Local reality:

Latentsync 1.5 fits only with tiling; 1.6 is better on teeth but 3-4x slower — about 25 minutes of compute per usable 90-second clip including failed attempts.
First-pass success was 5 in 10, and the variance is the killer: you never know if a run will be usable.
Environment maintenance nobody counts: three rebuilds in two years from Comfy conflicts, conservatively 40 hours.
All-in: 40 minutes of wall clock per clip vs. a few dollars hosted (sync.so), which returns while you do something else.

Verdict: hobby/experimental work — local wins easily; client work with deadlines — hosted won for the author around the eighth paid job, when variance cost more than money.

Technical limit: everything wav2lip-descended is windowed — short spans stitched together. Final stance: ComfyUI for experiments, hosted for other people's deadlines.

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Three months running Latentsync on 8GB locally: the real cost of "free"

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