ComfyUI 0.34.3 runs MiniMax H3 4x slower with hostbuf_grow errors, user reports
IRLMainCharacter · reddit · 2026-09-05
A Reddit user reports that running MiniMax H3 bf16 models on ComfyUI 0.34.3 spams the console with hostbufgrow errors (requesting 55GB beyond the reserved host buffer), matching GitHub issue #15575.
Outputs look correct but generation takes about 4x longer than a few weeks ago. The user suspects a regression after version 0.30.2 and is considering rolling back, asking the community which versions others are running and whether they see the same performance issues.
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