diff --git a/Pixiview/Illust/ViewIllustPage.xaml.cs b/Pixiview/Illust/ViewIllustPage.xaml.cs
index 6fe6ae8..62b99b1 100644
--- a/Pixiview/Illust/ViewIllustPage.xaml.cs
+++ b/Pixiview/Illust/ViewIllustPage.xaml.cs
@@ -317,7 +317,8 @@ namespace Pixiview.Illust
                 {
                     tmp[i] = new IllustDetailItem
                     {
-                        Id = illustItem.Id
+                        Id = illustItem.Id,
+                        Loading = true
                     };
                 }
                 Illusts = items = tmp;
diff --git a/Pixiview/Utils/Ugoira.cs b/Pixiview/Utils/Ugoira.cs
index bd832de..e18c056 100644
--- a/Pixiview/Utils/Ugoira.cs
+++ b/Pixiview/Utils/Ugoira.cs
@@ -455,12 +455,17 @@ namespace Pixiview.Utils
                                         {
                                             var cgImage = images[i].CGImage;
                                             var width = cgImage.Width;
-                                            using (CGBitmapContext bitmapContext = new CGBitmapContext(pxdata, width, cgImage.Height,
-                                                8, 4 * (width + width % 8), rgbColorSpace, CGImageAlphaInfo.NoneSkipFirst))
+                                            var height = cgImage.Height;
+                                            using (CGBitmapContext bitmapContext = new CGBitmapContext(
+                                                pxdata, width, height,
+                                                cgImage.BitsPerComponent,
+                                                4 * (width + width % 4),
+                                                rgbColorSpace,
+                                                CGImageAlphaInfo.NoneSkipFirst))
                                             {
                                                 if (bitmapContext != null)
                                                 {
-                                                    bitmapContext.DrawImage(new CGRect(0, 0, cgImage.Width, cgImage.Height), cgImage);
+                                                    bitmapContext.DrawImage(new CGRect(0, 0, width, height), cgImage);
                                                 }
                                             }
                                         }
@@ -482,7 +487,7 @@ namespace Pixiview.Utils
                             lastTime = CMTime.Add(lastTime, frameTime);
                             break;
                         }
-                        Thread.Sleep(100);
+                        Thread.Sleep(16);
                     }
                 }
                 writerInput.MarkAsFinished();