diff --git a/patches.py b/patches.py
index 65c891e..1ae91c1 100644
--- a/patches.py
+++ b/patches.py
@@ -2,10 +2,12 @@ from __future__ import annotations
 
 import contextlib
 import functools
+import inspect
 import json
 import logging
 import os
 import struct
+import threading
 from typing import Any, Callable
 
 import torch
@@ -39,6 +41,8 @@ _WARNED_PICKLE_GPU_PATHS: set[str] = set()
 _SAFE_TENSORS_COMPONENT_CACHE_MAX = 32
 _STICKY_PROTECTION_VRAM_FLOOR_RATIO = 0.125
 _STICKY_PROTECTION_VRAM_FLOOR_CEIL_BYTES = 16 * 1024 ** 3
+_TILED_VAE_MEMORY_LOCK_ATTR = "_gpu_resident_loader_tiled_memory_lock"
+_TILED_VAE_LOCK_INIT = threading.Lock()
 _SAFETENSORS_DTYPE_MAP = {
     "BOOL": torch.bool,
     "U8": torch.uint8,
@@ -927,6 +931,14 @@ def _temporary_tiled_vae_memory_estimate(
     if not callable(original):
         yield
         return
+    had_instance_attr = memory_attr in getattr(self, "__dict__", {})
+    lock = getattr(self, _TILED_VAE_MEMORY_LOCK_ATTR, None)
+    if lock is None:
+        with _TILED_VAE_LOCK_INIT:
+            lock = getattr(self, _TILED_VAE_MEMORY_LOCK_ATTR, None)
+            if lock is None:
+                lock = threading.RLock()
+                setattr(self, _TILED_VAE_MEMORY_LOCK_ATTR, lock)
 
     def estimated(shape, dtype, *args, **kwargs):
         shapes = _tiled_vae_memory_shapes(
@@ -940,18 +952,62 @@ def _temporary_tiled_vae_memory_estimate(
         )
         return max(int(original(candidate, dtype, *args, **kwargs)) for candidate in shapes)
 
-    setattr(self, memory_attr, estimated)
-    try:
-        yield
-    finally:
-        setattr(self, memory_attr, original)
+    with lock:
+        setattr(self, memory_attr, estimated)
+        try:
+            yield
+        finally:
+            if had_instance_attr:
+                setattr(self, memory_attr, original)
+            else:
+                delattr(self, memory_attr)
+
+
+@functools.lru_cache(maxsize=None)
+def _tiled_vae_supported_kwargs(func: Callable[..., Any]) -> frozenset[str]:
+    return frozenset(inspect.signature(func).parameters)
+
+
+def _call_tiled_vae(
+    func: Callable[..., Any],
+    self,
+    data,
+    *,
+    tile_x=None,
+    tile_y=None,
+    overlap=None,
+    tile_t=None,
+    overlap_t=None,
+):
+    kwargs = {}
+    supported_kwargs = _tiled_vae_supported_kwargs(func)
+    if "tile_x" in supported_kwargs:
+        kwargs["tile_x"] = tile_x
+    if "tile_y" in supported_kwargs:
+        kwargs["tile_y"] = tile_y
+    if "overlap" in supported_kwargs:
+        kwargs["overlap"] = overlap
+    if "tile_t" in supported_kwargs:
+        kwargs["tile_t"] = tile_t
+    if "overlap_t" in supported_kwargs:
+        kwargs["overlap_t"] = overlap_t
+    return func(self, data, **kwargs)
 
 
 def _wrap_vae_encode_tiled(func: Callable[..., Any]) -> Callable[..., Any]:
     @functools.wraps(func)
     def wrapper(self, pixel_samples, tile_x=None, tile_y=None, overlap=None, tile_t=None, overlap_t=None):
         if REGISTRY.get_policy() != "sticky_gpu":
-            return func(self, pixel_samples, tile_x=tile_x, tile_y=tile_y, overlap=overlap, tile_t=tile_t, overlap_t=overlap_t)
+            return _call_tiled_vae(
+                func,
+                self,
+                pixel_samples,
+                tile_x=tile_x,
+                tile_y=tile_y,
+                overlap=overlap,
+                tile_t=tile_t,
+                overlap_t=overlap_t,
+            )
 
         with _temporary_tiled_vae_memory_estimate(
             self,
@@ -960,7 +1016,16 @@ def _wrap_vae_encode_tiled(func: Callable[..., Any]) -> Callable[..., Any]:
             tile_y=tile_y,
             tile_t=tile_t,
         ):
-            return func(self, pixel_samples, tile_x=tile_x, tile_y=tile_y, overlap=overlap, tile_t=tile_t, overlap_t=overlap_t)
+            return _call_tiled_vae(
+                func,
+                self,
+                pixel_samples,
+                tile_x=tile_x,
+                tile_y=tile_y,
+                overlap=overlap,
+                tile_t=tile_t,
+                overlap_t=overlap_t,
+            )
 
     return wrapper
 
@@ -969,7 +1034,16 @@ def _wrap_vae_decode_tiled(func: Callable[..., Any]) -> Callable[..., Any]:
     @functools.wraps(func)
     def wrapper(self, samples, tile_x=None, tile_y=None, overlap=None, tile_t=None, overlap_t=None):
         if REGISTRY.get_policy() != "sticky_gpu":
-            return func(self, samples, tile_x=tile_x, tile_y=tile_y, overlap=overlap, tile_t=tile_t, overlap_t=overlap_t)
+            return _call_tiled_vae(
+                func,
+                self,
+                samples,
+                tile_x=tile_x,
+                tile_y=tile_y,
+                overlap=overlap,
+                tile_t=tile_t,
+                overlap_t=overlap_t,
+            )
 
         with _temporary_tiled_vae_memory_estimate(
             self,
@@ -978,7 +1052,16 @@ def _wrap_vae_decode_tiled(func: Callable[..., Any]) -> Callable[..., Any]:
             tile_y=tile_y,
             tile_t=tile_t,
         ):
-            return func(self, samples, tile_x=tile_x, tile_y=tile_y, overlap=overlap, tile_t=tile_t, overlap_t=overlap_t)
+            return _call_tiled_vae(
+                func,
+                self,
+                samples,
+                tile_x=tile_x,
+                tile_y=tile_y,
+                overlap=overlap,
+                tile_t=tile_t,
+                overlap_t=overlap_t,
+            )
 
     return wrapper