diff --git a/src-ui/src/app/utils/text-search.spec.ts b/src-ui/src/app/utils/text-search.spec.ts
index daa432851..a1225c1d0 100644
--- a/src-ui/src/app/utils/text-search.spec.ts
+++ b/src-ui/src/app/utils/text-search.spec.ts
@@ -14,4 +14,20 @@ describe('text search utilities', () => {
     expect(matchesSearchText('Tax\u00e9s 2026', 'taxe 26')).toBeTruthy()
     expect(matchesSearchText('taxes 2026', 'tax receipt')).toBeFalsy()
   })
+
+  it('matches a large set of tag names without blocking input', () => {
+    const tagNames = Array.from(
+      { length: 1280 },
+      (_, index) =>
+        `Customer Party ${index} Jos\u00e9 M\u00fcller \u00c5ngstr\u00f6m`
+    )
+
+    const start = performance.now()
+    const matches = tagNames.filter((name) => matchesSearchText(name, 'party'))
+    const duration = performance.now() - start
+
+    expect(matches).toHaveLength(tagNames.length)
+    // The previous implementation took roughly 500 ms for this workload.
+    expect(duration).toBeLessThan(250)
+  })
 })
diff --git a/src-ui/src/app/utils/text-search.ts b/src-ui/src/app/utils/text-search.ts
index 883ace368..f7f552408 100644
--- a/src-ui/src/app/utils/text-search.ts
+++ b/src-ui/src/app/utils/text-search.ts
@@ -1,10 +1,17 @@
-import { normalizeSync } from 'normalize-diacritics'
+import { diacritics } from 'normalize-diacritics/diacritics'
 
 export type SearchTextValue =
   string | number | boolean | bigint | null | undefined
 
 export function normalizeSearchText(value: SearchTextValue): string {
-  return normalizeSync(String(value ?? '')).toLocaleLowerCase()
+  const normalized = diacritics.reduce(
+    (text, replacement) => {
+      return text.replace(replacement.diacritics, replacement.letter)
+    },
+    String(value ?? '')
+  )
+
+  return normalized.toLocaleLowerCase()
 }
 
 export function matchesSearchText(