diff --git a/include/svl/IndexedStyleSheets.hxx b/include/svl/IndexedStyleSheets.hxx
index 1067316e9efc..790a07821b79 100644
--- a/include/svl/IndexedStyleSheets.hxx
+++ b/include/svl/IndexedStyleSheets.hxx
@@ -86,15 +86,15 @@ public:
      * If the style sheet is already contained, this call has no effect.
      */
     void
-    AddStyleSheet(rtl::Reference< SfxStyleSheetBase > style);
+    AddStyleSheet(const rtl::Reference< SfxStyleSheetBase >& style);
 
     /** Removes a style sheet. */
     bool
-    RemoveStyleSheet(rtl::Reference< SfxStyleSheetBase > style);
+    RemoveStyleSheet(const rtl::Reference< SfxStyleSheetBase >& style);
 
     /** Check whether a specified style sheet is stored. */
     bool
-    HasStyleSheet(rtl::Reference< SfxStyleSheetBase > style) const;
+    HasStyleSheet(const rtl::Reference< SfxStyleSheetBase >& style) const;
 
     /** Obtain the number of style sheets which are held */
     unsigned
diff --git a/include/svl/currencytable.hxx b/include/svl/currencytable.hxx
index 964038da3ed7..275391649ff5 100644
--- a/include/svl/currencytable.hxx
+++ b/include/svl/currencytable.hxx
@@ -36,7 +36,7 @@ public:
 
     size_t size() const;
 
-    void insert(iterator it, std::unique_ptr<NfCurrencyEntry> p);
+    void insert(const iterator& it, std::unique_ptr<NfCurrencyEntry> p);
 };
 
 #endif
diff --git a/include/svl/documentlockfile.hxx b/include/svl/documentlockfile.hxx
index b658dccf8c29..98dde757cf7b 100644
--- a/include/svl/documentlockfile.hxx
+++ b/include/svl/documentlockfile.hxx
@@ -39,7 +39,7 @@ class SVL_DLLPUBLIC DocumentLockFile : public LockFileCommon
 
     css::uno::Reference< css::io::XInputStream > OpenStream();
 
-    void WriteEntryToStream( const LockFileEntry& aEntry, css::uno::Reference< css::io::XOutputStream > xStream );
+    void WriteEntryToStream( const LockFileEntry& aEntry, const css::uno::Reference< css::io::XOutputStream >& xStream );
 
 public:
     DocumentLockFile( const OUString& aOrigURL );
diff --git a/include/svl/style.hxx b/include/svl/style.hxx
index 79814cc2d3b9..dc9c99df55fe 100644
--- a/include/svl/style.hxx
+++ b/include/svl/style.hxx
@@ -208,7 +208,7 @@ protected:
 
     virtual                     ~SfxStyleSheetBasePool();
 
-    void                        StoreStyleSheet(rtl::Reference< SfxStyleSheetBase >);
+    void                        StoreStyleSheet(const rtl::Reference< SfxStyleSheetBase >&);
 
     /** Obtain the indexed style sheets.
      */
diff --git a/include/svl/stylepool.hxx b/include/svl/stylepool.hxx
index 93caa6aea0f9..461ba2f3bc6b 100644
--- a/include/svl/stylepool.hxx
+++ b/include/svl/stylepool.hxx
@@ -69,7 +69,7 @@ public:
 
     virtual ~StylePool();
 
-    static OUString nameOf( SfxItemSet_Pointer_t pSet );
+    static OUString nameOf( const SfxItemSet_Pointer_t& pSet );
 };
 
 class SVL_DLLPUBLIC IStylePoolIteratorAccess
diff --git a/svl/source/items/IndexedStyleSheets.cxx b/svl/source/items/IndexedStyleSheets.cxx
index f543d18b15d6..750a7fd18771 100644
--- a/svl/source/items/IndexedStyleSheets.cxx
+++ b/svl/source/items/IndexedStyleSheets.cxx
@@ -86,7 +86,7 @@ IndexedStyleSheets::GetNumberOfStyleSheets() const
 }
 
 void
-IndexedStyleSheets::AddStyleSheet(rtl::Reference< SfxStyleSheetBase > style)
+IndexedStyleSheets::AddStyleSheet(const rtl::Reference< SfxStyleSheetBase >& style)
 {
     if (!HasStyleSheet(style)) {
         mStyleSheets.push_back(style);
@@ -96,7 +96,7 @@ IndexedStyleSheets::AddStyleSheet(rtl::Reference< SfxStyleSheetBase > style)
 }
 
 bool
-IndexedStyleSheets::RemoveStyleSheet(rtl::Reference< SfxStyleSheetBase > style)
+IndexedStyleSheets::RemoveStyleSheet(const rtl::Reference< SfxStyleSheetBase >& style)
 {
     rtl::OUString styleName = style->GetName();
     std::vector<unsigned> positions = FindPositionsByName(styleName);
@@ -207,7 +207,7 @@ IndexedStyleSheets::~IndexedStyleSheets()
 {;}
 
 bool
-IndexedStyleSheets::HasStyleSheet(rtl::Reference< SfxStyleSheetBase > style) const
+IndexedStyleSheets::HasStyleSheet(const rtl::Reference< SfxStyleSheetBase >& style) const
 {
     rtl::OUString styleName = style->GetName();
     std::vector<unsigned> positions = FindPositionsByName(styleName);
diff --git a/svl/source/items/style.cxx b/svl/source/items/style.cxx
index 1ec3a1870c4b..4221020c5077 100644
--- a/svl/source/items/style.cxx
+++ b/svl/source/items/style.cxx
@@ -965,7 +965,7 @@ SfxUnoStyleSheet* SfxUnoStyleSheet::getUnoStyleSheet( const css::uno::Reference<
 }
 
 void
-SfxStyleSheetBasePool::StoreStyleSheet(rtl::Reference< SfxStyleSheetBase > xStyle)
+SfxStyleSheetBasePool::StoreStyleSheet(const rtl::Reference< SfxStyleSheetBase >& xStyle)
 {
     pImp->mxIndexedStyleSheets->AddStyleSheet(xStyle);
 }
diff --git a/svl/source/items/stylepool.cxx b/svl/source/items/stylepool.cxx
index f75435a6c59b..f260672d8d4e 100644
--- a/svl/source/items/stylepool.cxx
+++ b/svl/source/items/stylepool.cxx
@@ -332,7 +332,7 @@ namespace {
  * This static method creates a unique name from a shared pointer to a SfxItemSet
  * The name is the memory address of the SfxItemSet itself.
  */
-OUString StylePool::nameOf( SfxItemSet_Pointer_t pSet )
+OUString StylePool::nameOf( const SfxItemSet_Pointer_t& pSet )
 {
     return OUString::number( reinterpret_cast<sal_IntPtr>( pSet.get() ), 16 );
 }
diff --git a/svl/source/misc/documentlockfile.cxx b/svl/source/misc/documentlockfile.cxx
index 6cd169972739..d71e2e958e5a 100644
--- a/svl/source/misc/documentlockfile.cxx
+++ b/svl/source/misc/documentlockfile.cxx
@@ -63,7 +63,7 @@ DocumentLockFile::~DocumentLockFile()
 }
 
 
-void DocumentLockFile::WriteEntryToStream( const LockFileEntry& aEntry, uno::Reference< io::XOutputStream > xOutput )
+void DocumentLockFile::WriteEntryToStream( const LockFileEntry& aEntry, const uno::Reference< io::XOutputStream >& xOutput )
 {
     ::osl::MutexGuard aGuard( m_aMutex );
 
diff --git a/svl/source/numbers/currencytable.cxx b/svl/source/numbers/currencytable.cxx
index 17e362d1c833..380e47bd4a2e 100644
--- a/svl/source/numbers/currencytable.cxx
+++ b/svl/source/numbers/currencytable.cxx
@@ -29,7 +29,7 @@ size_t NfCurrencyTable::size() const
     return maData.size();
 }
 
-void NfCurrencyTable::insert(iterator it, std::unique_ptr<NfCurrencyEntry> p)
+void NfCurrencyTable::insert(const iterator& it, std::unique_ptr<NfCurrencyEntry> p)
 {
     maData.insert(it, std::move(p));
 }