diff --git a/Source/WebCore/platform/graphics/FontCache.h b/Source/WebCore/platform/graphics/FontCache.h
index 9f1b68b8f1e2..09bd1bc692f2 100644
--- a/Source/WebCore/platform/graphics/FontCache.h
+++ b/Source/WebCore/platform/graphics/FontCache.h
@@ -257,6 +257,10 @@ class FontCache : public CanMakeCheckedPtr<FontCache> {
     UncheckedKeyHashSet<AtomString> m_knownFamilies;
 #endif
 
+#if PLATFORM(QT)
+    UncheckedKeyHashMap<AtomString, bool> m_fontFamilyCache;
+#endif
+
 #if PLATFORM(COCOA)
     FontDatabase m_databaseAllowingUserInstalledFonts { AllowUserInstalledFonts::Yes };
     FontDatabase m_databaseDisallowingUserInstalledFonts { AllowUserInstalledFonts::No };
diff --git a/Source/WebCore/platform/graphics/qt/FontCacheQt.cpp b/Source/WebCore/platform/graphics/qt/FontCacheQt.cpp
index 7856f8e64525..3149e4ac0b86 100644
--- a/Source/WebCore/platform/graphics/qt/FontCacheQt.cpp
+++ b/Source/WebCore/platform/graphics/qt/FontCacheQt.cpp
@@ -96,7 +96,11 @@ Ref<Font> FontCache::lastResortFallbackFont(const FontDescription& fontDescripti
 
 std::unique_ptr<FontPlatformData> FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomString& family, const FontCreationContext&, OptionSet<FontLookupOptions>)
 {
-    if (!QFontDatabase::hasFamily(family.string()))
+    auto addResult = m_fontFamilyCache.ensure(family, [&family] {
+        return QFontDatabase::hasFamily(family.string());
+    });
+
+    if (!addResult.iterator->value)
         return nullptr;
     return std::make_unique<FontPlatformData>(fontDescription, family);
 }