diff --git a/README.MD b/README.MD
index 998e56f..1b97fc4 100644
--- a/README.MD
+++ b/README.MD
@@ -80,6 +80,7 @@ When this error has occurred, please check the network environment.
 ## Update
 <font size="4">**If the dependency package error after updating, please reinstall the relevant dependency packages. </font><br />    
 
+* Optimize performance of the ```vitmate``` method for Ultra nodes when processing large-size image.
 * [CropByMaskV2](#CropByMaskV2) add option to round the cutting size by multiples.
 * Commit [CheckMask](#CheckMask) node, it detect whether the mask contains sufficient effective areas. Commit [HSVValue](#HSVValue) node, it convert color values to HSV values.
 * [BooleanOperatorV2](#BooleanOperatorV2), [NumberCalculatorV2](#NumberCalculatorV2), [Integer](#Integer), [Float](#Float), [Boolean](#Boolean) nodes add string output to output the value as a string for use with [SwitchCase](#SwitchCase).
diff --git a/README_CN.MD b/README_CN.MD
index f114dc8..0884583 100644
--- a/README_CN.MD
+++ b/README_CN.MD
@@ -80,6 +80,7 @@ git clone https://github.com/chflame163/ComfyUI_LayerStyle.git
 ## 更新说明
 <font size="4">**如果本插件更新后出现依赖包错误，请重新安装相关依赖包。
 
+* 优化Ultra节点的```vitmatte```方法在处理大尺寸图片时的性能。
 * [CropByMaskV2](#CropByMaskV2) 增加裁切尺寸按倍数取整选项。
 * 添加 [CheckMask](#CheckMask) 节点, 用于检测遮罩是否包含足够的有效区域。
 * 添加 [HSVValue](#HSVValue) 节点, 用于转换色值为HSV值。
diff --git a/py/imagefunc.py b/py/imagefunc.py
index dc24e87..47b35a9 100644
--- a/py/imagefunc.py
+++ b/py/imagefunc.py
@@ -1402,6 +1402,11 @@ def generate_VITMatte(image:Image, trimap:Image, local_files_only:bool=False) ->
         image = image.convert('RGB')
     if trimap.mode != 'L':
         trimap = trimap.convert('L')
+    max_size = 2048
+    width, height = image.size
+    if width * height > max_size * max_size:
+        image = image.resize((max_size, max_size), Image.BILINEAR)
+        trimap = trimap.resize((max_size, max_size), Image.BILINEAR)
     model_name = "hustvl/vitmatte-small-composition-1k"
     vit_matte_model = load_VITMatte_model(model_name=model_name, local_files_only=local_files_only)
     inputs = vit_matte_model.processor(images=image, trimaps=trimap, return_tensors="pt")
@@ -1410,25 +1415,28 @@ def generate_VITMatte(image:Image, trimap:Image, local_files_only:bool=False) ->
     mask = tensor2pil(predictions).convert('L')
     mask = mask.crop(
         (0, 0, image.width, image.height))  # remove padding that the prediction appends (works in 32px tiles)
+    if width * height > max_size * max_size:
+        mask = mask.resize((width, height), Image.BILINEAR)
     return mask
 
 def generate_VITMatte_trimap(mask:torch.Tensor, erode_kernel_size:int, dilate_kernel_size:int) -> Image:
+    def g_trimap(mask, erode_kernel_size=10, dilate_kernel_size=10):
+        erode_kernel = np.ones((erode_kernel_size, erode_kernel_size), np.uint8)
+        dilate_kernel = np.ones((dilate_kernel_size, dilate_kernel_size), np.uint8)
+        eroded = cv2.erode(mask, erode_kernel, iterations=5)
+        dilated = cv2.dilate(mask, dilate_kernel, iterations=5)
+        trimap = np.zeros_like(mask)
+        trimap[dilated == 255] = 128
+        trimap[eroded == 255] = 255
+        return trimap
+
     mask = mask.squeeze(0).cpu().detach().numpy().astype(np.uint8) * 255
-    trimap = __generate_trimap(mask, erode_kernel_size, dilate_kernel_size).astype(np.float32)
+    trimap = g_trimap(mask, erode_kernel_size, dilate_kernel_size).astype(np.float32)
     trimap[trimap == 128] = 0.5
     trimap[trimap == 255] = 1
     trimap = torch.from_numpy(trimap).unsqueeze(0)
-    return tensor2pil(trimap).convert('L')
 
-def __generate_trimap(mask, erode_kernel_size=10, dilate_kernel_size=10):
-    erode_kernel = np.ones((erode_kernel_size, erode_kernel_size), np.uint8)
-    dilate_kernel = np.ones((dilate_kernel_size, dilate_kernel_size), np.uint8)
-    eroded = cv2.erode(mask, erode_kernel, iterations=5)
-    dilated = cv2.dilate(mask, dilate_kernel, iterations=5)
-    trimap = np.zeros_like(mask)
-    trimap[dilated == 255] = 128
-    trimap[eroded == 255] = 255
-    return trimap
+    return tensor2pil(trimap).convert('L')
 
 
 def get_a_person_mask_generator_model_path() -> str:
diff --git a/py/purge_vram.py b/py/purge_vram.py
index 7797d40..4c1fb01 100644
--- a/py/purge_vram.py
+++ b/py/purge_vram.py
@@ -1,9 +1,8 @@
+import comfy.model_management as mm
 from .imagefunc import AnyType
 
 any = AnyType("*")
-
 NODE_NAME = 'PurgeVRAM'
-
 class PurgeVRAM:
 
     def __init__(self):
@@ -30,14 +29,14 @@ class PurgeVRAM:
         import torch.cuda
         import gc
         import comfy.model_management
+        gc.collect()
         if purge_cache:
             if torch.cuda.is_available():
-                gc.collect()
                 torch.cuda.empty_cache()
                 torch.cuda.ipc_collect()
         if purge_models:
             comfy.model_management.unload_all_models()
-
+            comfy.model_management.soft_empty_cache()
         return (None,)