diff --git a/Tests/helper.py b/Tests/helper.py
index 909fff879c8..ec61cd263e9 100644
--- a/Tests/helper.py
+++ b/Tests/helper.py
@@ -161,6 +161,12 @@ def assert_tuple_approx_equal(
             pytest.fail(msg + ": " + repr(actuals) + " != " + repr(targets))
 
 
+def timeout_unless_slower_valgrind(timeout: float) -> pytest.MarkDecorator:
+    if "PILLOW_VALGRIND_TEST" in os.environ:
+        return pytest.mark.pil_noop_mark()
+    return pytest.mark.timeout(timeout)
+
+
 def skip_unless_feature(feature: str) -> pytest.MarkDecorator:
     reason = f"{feature} not available"
     return pytest.mark.skipif(not features.check(feature), reason=reason)
diff --git a/Tests/test_file_jpeg.py b/Tests/test_file_jpeg.py
index 7c33c751720..b9eec591dcf 100644
--- a/Tests/test_file_jpeg.py
+++ b/Tests/test_file_jpeg.py
@@ -32,6 +32,7 @@
     is_win32,
     mark_if_feature_version,
     skip_unless_feature,
+    timeout_unless_slower_valgrind,
 )
 
 ElementTree: ModuleType | None
@@ -1033,10 +1034,7 @@ def test_save_xmp(self, tmp_path: Path) -> None:
         with pytest.raises(ValueError):
             im.save(f, xmp=b"1" * 65505)
 
-    @pytest.mark.timeout(timeout=1)
-    @pytest.mark.xfail(
-        "PILLOW_VALGRIND_TEST" in os.environ, reason="Valgrind is slower"
-    )
+    @timeout_unless_slower_valgrind(1)
     def test_eof(self, monkeypatch: pytest.MonkeyPatch) -> None:
         # Even though this decoder never says that it is finished
         # the image should still end when there is no new data
diff --git a/Tests/test_file_pdf.py b/Tests/test_file_pdf.py
index bde1e3ab847..a2218673b44 100644
--- a/Tests/test_file_pdf.py
+++ b/Tests/test_file_pdf.py
@@ -13,7 +13,12 @@
 
 from PIL import Image, PdfParser, features
 
-from .helper import hopper, mark_if_feature_version, skip_unless_feature
+from .helper import (
+    hopper,
+    mark_if_feature_version,
+    skip_unless_feature,
+    timeout_unless_slower_valgrind,
+)
 
 
 def helper_save_as_pdf(tmp_path: Path, mode: str, **kwargs: Any) -> str:
@@ -339,8 +344,7 @@ def test_pdf_append_to_bytesio() -> None:
     assert len(f.getvalue()) > initial_size
 
 
-@pytest.mark.timeout(1)
-@pytest.mark.skipif("PILLOW_VALGRIND_TEST" in os.environ, reason="Valgrind is slower")
+@timeout_unless_slower_valgrind(1)
 @pytest.mark.parametrize("newline", (b"\r", b"\n"))
 def test_redos(newline: bytes) -> None:
     malicious = b" trailer<<>>" + newline * 3456
diff --git a/Tests/test_file_tiff.py b/Tests/test_file_tiff.py
index b6985b83b36..d0d394aa9cd 100644
--- a/Tests/test_file_tiff.py
+++ b/Tests/test_file_tiff.py
@@ -26,6 +26,7 @@
     hopper,
     is_pypy,
     is_win32,
+    timeout_unless_slower_valgrind,
 )
 
 ElementTree: ModuleType | None
@@ -988,11 +989,8 @@ def test_string_dimension(self) -> None:
             with pytest.raises(OSError):
                 im.load()
 
-    @pytest.mark.timeout(6)
+    @timeout_unless_slower_valgrind(6)
     @pytest.mark.filterwarnings("ignore:Truncated File Read")
-    @pytest.mark.xfail(
-        "PILLOW_VALGRIND_TEST" in os.environ, reason="Valgrind is slower"
-    )
     def test_timeout(self, monkeypatch: pytest.MonkeyPatch) -> None:
         with Image.open("Tests/images/timeout-6646305047838720") as im:
             monkeypatch.setattr(ImageFile, "LOAD_TRUNCATED_IMAGES", True)
@@ -1004,10 +1002,7 @@ def test_timeout(self, monkeypatch: pytest.MonkeyPatch) -> None:
             "Tests/images/oom-225817ca0f8c663be7ab4b9e717b02c661e66834.tif",
         ],
     )
-    @pytest.mark.timeout(2)
-    @pytest.mark.xfail(
-        "PILLOW_VALGRIND_TEST" in os.environ, reason="Valgrind is slower"
-    )
+    @timeout_unless_slower_valgrind(2)
     def test_oom(self, test_file: str) -> None:
         with pytest.raises(UnidentifiedImageError):
             with pytest.warns(UserWarning):
diff --git a/Tests/test_image.py b/Tests/test_image.py
index 7e6118d5280..14a0671277d 100644
--- a/Tests/test_image.py
+++ b/Tests/test_image.py
@@ -34,6 +34,7 @@
     is_win32,
     mark_if_feature_version,
     skip_unless_feature,
+    timeout_unless_slower_valgrind,
 )
 
 ElementTree: ModuleType | None
@@ -572,10 +573,7 @@ def test_check_size(self) -> None:
         i = Image.new("RGB", [1, 1])
         assert isinstance(i.size, tuple)
 
-    @pytest.mark.timeout(0.75)
-    @pytest.mark.skipif(
-        "PILLOW_VALGRIND_TEST" in os.environ, reason="Valgrind is slower"
-    )
+    @timeout_unless_slower_valgrind(0.75)
     @pytest.mark.parametrize("size", ((0, 100000000), (100000000, 0)))
     def test_empty_image(self, size: tuple[int, int]) -> None:
         Image.new("RGB", size)
diff --git a/Tests/test_imagefontpil.py b/Tests/test_imagefontpil.py
index e5b770745c9..3eb98d3797d 100644
--- a/Tests/test_imagefontpil.py
+++ b/Tests/test_imagefontpil.py
@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import os
 import struct
 from io import BytesIO
 
@@ -8,7 +7,7 @@
 
 from PIL import Image, ImageDraw, ImageFont, _util, features
 
-from .helper import assert_image_equal_tofile
+from .helper import assert_image_equal_tofile, timeout_unless_slower_valgrind
 
 fonts = [ImageFont.load_default_imagefont()]
 if not features.check_module("freetype2"):
@@ -73,8 +72,7 @@ def test_decompression_bomb() -> None:
         font.getmask("A" * 1_000_000)
 
 
-@pytest.mark.timeout(4)
-@pytest.mark.xfail("PILLOW_VALGRIND_TEST" in os.environ, reason="Valgrind is slower")
+@timeout_unless_slower_valgrind(4)
 def test_oom() -> None:
     glyph = struct.pack(
         ">hhhhhhhhhh", 1, 0, -32767, -32767, 32767, 32767, -32767, -32767, 32767, 32767