Use my home-made GIF and APNG animator. It's really save CPU compared to previous one!

QuickLook.Plugin/QuickLook.Plugin.ImageViewer/AnimatedImage/ImageMagickProvider.cs

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+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
+using System.IO;
+using System.Reflection;
+using System.Windows;
+using System.Windows.Media.Animation;
+using ImageMagick;
+
+namespace QuickLook.Plugin.ImageViewer.AnimatedImage
+{
+    internal class ImageMagickProvider : IAnimationProvider
+    {
+        public void GetAnimator(ObjectAnimationUsingKeyFrames animator, string path)
+        {
+            // set dcraw.exe for Magick.NET
+            Directory.SetCurrentDirectory(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location));
+
+            using (var image = new MagickImage(path))
+            {
+                image.Rotate(image.Orientation == OrientationType.RightTop
+                    ? 90
+                    : image.Orientation == OrientationType.BottomRight
+                        ? 180
+                        : image.Orientation == OrientationType.LeftBotom
+                            ? 270
+                            : 0);
+
+                animator.KeyFrames.Add(new DiscreteObjectKeyFrame(image.ToBitmapSource(), TimeSpan.Zero));
+                animator.Duration = Duration.Forever;
+            }
+
+            Directory.SetCurrentDirectory(App.AppPath);
+        }
+    }
+}