Make lowvram less aggressive when there are large amounts of free memory.

comfy/model_management.py

@@ -446,7 +446,7 @@ def load_models_gpu(models, memory_required=0, force_patch_weights=False):
         if lowvram_available and (vram_set_state == VRAMState.LOW_VRAM or vram_set_state == VRAMState.NORMAL_VRAM):
             model_size = loaded_model.model_memory_required(torch_dev)
             current_free_mem = get_free_memory(torch_dev)
-            lowvram_model_memory = int(max(64 * (1024 * 1024), (current_free_mem - 1024 * (1024 * 1024)) / 1.3 ))
+            lowvram_model_memory = int(max(64 * (1024 * 1024), (current_free_mem - extra_mem)))
             if model_size <= (current_free_mem - inference_memory): #only switch to lowvram if really necessary
                 lowvram_model_memory = 0