diff --git a/.werks/17278.md b/.werks/17278.md
new file mode 100644
index 00000000000..53f44c97753
--- /dev/null
+++ b/.werks/17278.md
@@ -0,0 +1,18 @@
+[//]: # (werk v2)
+# Service grouping long loading or timeout
+
+key        | value
+---------- | ---
+date       | 2024-12-17T13:07:27+00:00
+version    | 2.3.0p24
+class      | fix
+edition    | cre
+component  | multisite
+level      | 1
+compatible | yes
+
+When configuring the global setting "Grouping of services in table views"
+with specific grouping expressions (for example `(?!.*(CPU)).*`) this could cause
+long loading times or even timeouts of view.
+
+This is now fixed and the grouping works as expected.
diff --git a/cmk/gui/views/layout/layouts.py b/cmk/gui/views/layout/layouts.py
index 3ec47d66fca..c3d9665376d 100644
--- a/cmk/gui/views/layout/layouts.py
+++ b/cmk/gui/views/layout/layouts.py
@@ -409,10 +409,14 @@ def try_to_match_group(row: Row) -> GroupSpec | None:
             group_spec["pattern"], row["service_description"]
         ):
             if re.findall(r"(\([^)]*\))", group_spec["pattern"]):
-                group_spec["title"] = re.sub(
-                    group_spec["pattern"],
-                    escape_regex_chars(group_spec["title"]),
-                    row["service_description"],
+                return GroupSpec(
+                    title=re.sub(
+                        group_spec["pattern"],
+                        escape_regex_chars(group_spec["title"]),
+                        row["service_description"],
+                    ),
+                    pattern=group_spec["pattern"],
+                    min_items=group_spec["min_items"],
                 )
             return group_spec