diff --git a/NvimView/Sources/NvimView/NvimView+Draw.swift b/NvimView/Sources/NvimView/NvimView+Draw.swift
index 126e8594..2d86be13 100644
--- a/NvimView/Sources/NvimView/NvimView+Draw.swift
+++ b/NvimView/Sources/NvimView/NvimView+Draw.swift
@@ -222,8 +222,7 @@ extension NvimView {
     columnRange: ClosedRange<Int>
   ) -> [AttributesRun] {
     rowRange.map { row in
-      self.ugrid.cells[row][columnRange]
-        .groupedRanges(with: { cell in cell.attrId })
+      groupedRanges(of: self.ugrid.cells[row][columnRange])
         .compactMap { range in
           let cells = self.ugrid.cells[row][range]
 
@@ -273,3 +272,38 @@ private let infoTextAttrs = [
 ]
 
 private let colorSpace = NSColorSpace.sRGB
+
+/// When we use the following private function instead of the public extension function in
+/// Commons.FoundationCommons.swift.groupedRanges(with:), then, according to Instruments
+/// the percentage of the function is reduced from ~ 15% to 0%.
+/// Keep the logic in sync with Commons.FoundationCommons.swift.groupedRanges(with:). Tests are
+/// present in Commons lib.
+private func groupedRanges(of cells: ArraySlice<UCell>) -> [ClosedRange<Int>] {
+  if cells.isEmpty { return [] }
+  if cells.count == 1 { return [cells.startIndex...cells.startIndex] }
+
+  var result = [ClosedRange<Int>]()
+  result.reserveCapacity(cells.count / 2)
+
+  let inclusiveEndIndex = cells.endIndex - 1
+  var lastStartIndex = cells.startIndex
+  var lastEndIndex = cells.startIndex
+  var lastMarker = cells.first!.attrId // cells is not empty!
+  for i in cells.startIndex..<cells.endIndex {
+    let currentMarker = cells[i].attrId
+
+    if lastMarker == currentMarker {
+      if i == inclusiveEndIndex { result.append(lastStartIndex...i) }
+    } else {
+      result.append(lastStartIndex...lastEndIndex)
+      lastMarker = currentMarker
+      lastStartIndex = i
+
+      if i == inclusiveEndIndex { result.append(i...i) }
+    }
+
+    lastEndIndex = i
+  }
+
+  return result
+}
diff --git a/VimR/VimR.xcodeproj/project.pbxproj b/VimR/VimR.xcodeproj/project.pbxproj
index 6c370122..5c3bea30 100644
--- a/VimR/VimR.xcodeproj/project.pbxproj
+++ b/VimR/VimR.xcodeproj/project.pbxproj
@@ -1127,7 +1127,7 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_IDENTITY = "-";
 				COPY_PHASE_STRIP = NO;
-				CURRENT_PROJECT_VERSION = 20220910.153746;
+				CURRENT_PROJECT_VERSION = 20220913.230838;
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
@@ -1188,7 +1188,7 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_IDENTITY = "-";
 				COPY_PHASE_STRIP = NO;
-				CURRENT_PROJECT_VERSION = 20220910.153746;
+				CURRENT_PROJECT_VERSION = 20220913.230838;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
@@ -1217,7 +1217,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 20220910.153746;
+				CURRENT_PROJECT_VERSION = 20220913.230838;
 				DEFINES_MODULE = YES;
 				IBC_MODULE = VimR;
 				INFOPLIST_FILE = VimR/Info.plist;
@@ -1239,7 +1239,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 20220910.153746;
+				CURRENT_PROJECT_VERSION = 20220913.230838;
 				DEFINES_MODULE = YES;
 				IBC_MODULE = VimR;
 				INFOPLIST_FILE = VimR/Info.plist;
diff --git a/VimR/VimR/Info.plist b/VimR/VimR/Info.plist
index d0f3cc75..6b214c13 100644
--- a/VimR/VimR/Info.plist
+++ b/VimR/VimR/Info.plist
@@ -1224,7 +1224,7 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.42.1</string>
+	<string>0.42.2</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleURLTypes</key>
@@ -1241,7 +1241,7 @@
 		</dict>
 	</array>
 	<key>CFBundleVersion</key>
-	<string>20220910.153746</string>
+	<string>20220913.230838</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.productivity</string>
 	<key>LSMinimumSystemVersion</key>
diff --git a/VimR/VimRTests/Info.plist b/VimR/VimRTests/Info.plist
index 873086d2..90332d44 100644
--- a/VimR/VimRTests/Info.plist
+++ b/VimR/VimRTests/Info.plist
@@ -15,10 +15,10 @@
 	<key>CFBundlePackageType</key>
 	<string>BNDL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.42.1</string>
+	<string>0.42.2</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>20220910.153746</string>
+	<string>20220913.230838</string>
 </dict>
 </plist>
diff --git a/appcast.xml b/appcast.xml
index 081fe4fa..cf706a8f 100644
--- a/appcast.xml
+++ b/appcast.xml
@@ -6,22 +6,22 @@
     <description>Most recent changes with links to updates for VimR.</description>
     <language>en</language>
     <item>
-      <title>v0.42.1-20220910.153746</title>
+      <title>v0.42.2-20220913.230838</title>
       <link>https://twitter.com/vimrefined</link>
-      <sparkle:version>20220910.153746</sparkle:version>
-      <sparkle:shortVersionString>v0.42.1</sparkle:shortVersionString>
+      <sparkle:version>20220913.230838</sparkle:version>
+      <sparkle:shortVersionString>v0.42.2</sparkle:shortVersionString>
       <description><![CDATA[
     <ul>
-<li>Bugfix: Memory leak (custom tabs).</li>
+<li>Improve rendering performance.</li>
 </ul>
   ]]></description>
       <releaseNotesLink>
-        https://github.com/qvacua/vimr/releases/tag/v0.42.1-20220910.153746
+        https://github.com/qvacua/vimr/releases/tag/v0.42.2-20220913.230838
       </releaseNotesLink>
-      <pubDate>2022-09-10T15:46:20.838961</pubDate>
+      <pubDate>2022-09-13T23:18:03.725690</pubDate>
       <minimumSystemVersion>10.13.0</minimumSystemVersion>
-      <enclosure url="https://github.com/qvacua/vimr/releases/download/v0.42.1-20220910.153746/VimR-v0.42.1.tar.bz2"
-                 sparkle:edSignature="TVgFx+Ceev99TOq4Xc1iSu4uh7Ko+sS2tiyyM607inTsxbDNL3lr+Cm/WzloyNdrLC85ifMSq6AhPfAwkJaQCQ==" length="21437371"
+      <enclosure url="https://github.com/qvacua/vimr/releases/download/v0.42.2-20220913.230838/VimR-v0.42.2.tar.bz2"
+                 sparkle:edSignature="AbabQPPjogx60fPES3jGH0aqiko9Vc6d2+i+h6vycAlX8GQKNIGRjeEe7gx17pSrvfdMmHdztGE5hETOI6reBw==" length="21682056"
                  type="application/octet-stream"/>
     </item>
   </channel>
diff --git a/appcast_snapshot.xml b/appcast_snapshot.xml
index 081fe4fa..cf706a8f 100644
--- a/appcast_snapshot.xml
+++ b/appcast_snapshot.xml
@@ -6,22 +6,22 @@
     <description>Most recent changes with links to updates for VimR.</description>
     <language>en</language>
     <item>
-      <title>v0.42.1-20220910.153746</title>
+      <title>v0.42.2-20220913.230838</title>
       <link>https://twitter.com/vimrefined</link>
-      <sparkle:version>20220910.153746</sparkle:version>
-      <sparkle:shortVersionString>v0.42.1</sparkle:shortVersionString>
+      <sparkle:version>20220913.230838</sparkle:version>
+      <sparkle:shortVersionString>v0.42.2</sparkle:shortVersionString>
       <description><![CDATA[
     <ul>
-<li>Bugfix: Memory leak (custom tabs).</li>
+<li>Improve rendering performance.</li>
 </ul>
   ]]></description>
       <releaseNotesLink>
-        https://github.com/qvacua/vimr/releases/tag/v0.42.1-20220910.153746
+        https://github.com/qvacua/vimr/releases/tag/v0.42.2-20220913.230838
       </releaseNotesLink>
-      <pubDate>2022-09-10T15:46:20.838961</pubDate>
+      <pubDate>2022-09-13T23:18:03.725690</pubDate>
       <minimumSystemVersion>10.13.0</minimumSystemVersion>
-      <enclosure url="https://github.com/qvacua/vimr/releases/download/v0.42.1-20220910.153746/VimR-v0.42.1.tar.bz2"
-                 sparkle:edSignature="TVgFx+Ceev99TOq4Xc1iSu4uh7Ko+sS2tiyyM607inTsxbDNL3lr+Cm/WzloyNdrLC85ifMSq6AhPfAwkJaQCQ==" length="21437371"
+      <enclosure url="https://github.com/qvacua/vimr/releases/download/v0.42.2-20220913.230838/VimR-v0.42.2.tar.bz2"
+                 sparkle:edSignature="AbabQPPjogx60fPES3jGH0aqiko9Vc6d2+i+h6vycAlX8GQKNIGRjeEe7gx17pSrvfdMmHdztGE5hETOI6reBw==" length="21682056"
                  type="application/octet-stream"/>
     </item>
   </channel>
diff --git a/resources/release-notes.md b/resources/release-notes.md
index 88a6cb2e..c222f2c2 100644
--- a/resources/release-notes.md
+++ b/resources/release-notes.md
@@ -1,5 +1,13 @@
 # Next
 
+* ...
+
+# 0.42.2-20220913.230838
+
+* Improve rendering performance.
+
+# 0.42.1-20220910.153746
+
 * Bugfix: Memory leak (custom tabs).
 
 # 0.42.0-20220703.104316