From 88fec4b605a576bb74a679ccd9a4001807be96d5 Mon Sep 17 00:00:00 2001
From: comfyanonymous <121283862+comfyanonymous@users.noreply.github.com>
Date: Thu, 6 Aug 2026 15:17:44 -0700
Subject: [PATCH] Skip creating useless noise in res_multistep sampler.
 (#15339)

---
 comfy/k_diffusion/sampling.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/comfy/k_diffusion/sampling.py b/comfy/k_diffusion/sampling.py
index 11db46d94..11b2479e0 100644
--- a/comfy/k_diffusion/sampling.py
+++ b/comfy/k_diffusion/sampling.py
@@ -1445,7 +1445,7 @@ def res_multistep(model, x, sigmas, extra_args=None, callback=None, disable=None
                 x = sigma_fn(h) * x + h * (b1 * denoised + b2 * old_denoised)
 
         # Noise addition
-        if sigmas[i + 1] > 0:
+        if sigma_up > 0:
             x = x + noise_sampler(sigmas[i], sigmas[i + 1]) * s_noise * sigma_up
 
         if cfg_pp: