diff --git a/Pixiview/Illust/ViewIllustPage.xaml.cs b/Pixiview/Illust/ViewIllustPage.xaml.cs
index fb20ea7..01a383e 100644
--- a/Pixiview/Illust/ViewIllustPage.xaml.cs
+++ b/Pixiview/Illust/ViewIllustPage.xaml.cs
@@ -116,13 +116,15 @@ namespace Pixiview.Illust
 
         public IllustItem IllustItem { get; private set; }
 
-        private readonly object sync = new object();
         private readonly bool saveFavorites;
         private readonly ImageSource fontIconLove;
         private readonly ImageSource fontIconNotLove;
         private IllustUgoiraData ugoiraData;
         private Ugoira ugoira;
 
+        private volatile int downloaded = 0;
+        private int pageCount;
+
         public ViewIllustPage(IllustItem illust, bool save)
         {
             IllustItem = illust;
@@ -137,7 +139,11 @@ namespace Pixiview.Illust
                 ? fontIconLove
                 : fontIconNotLove;
 
-            ProgressVisible = IsPageVisible = illust != null && illust.PageCount > 1;
+            if (illust != null)
+            {
+                pageCount = illust.PageCount;
+                ProgressVisible = IsPageVisible = pageCount > 1;
+            }
             Resources.Add("carouselView", GetCarouseTemplate());
 
             InitializeComponent();
@@ -335,11 +341,12 @@ namespace Pixiview.Illust
                         illust.CopyToItem(illustItem);
                         MainThread.BeginInvokeOnMainThread(() =>
                         {
-                            var pageCount = illustItem.PageCount;
+                            var count = illustItem.PageCount;
+                            pageCount = count;
                             Title = illustItem.Title;
-                            IsPageVisible = pageCount > 1;
+                            IsPageVisible = count > 1;
                             IsAnimateSliderVisible = illustItem.IsAnimeVisible;
-                            ProgressVisible = pageCount > 1;
+                            ProgressVisible = count > 1;
                         });
                         if (preload.user.TryGetValue(illust.userId, out var user))
                         {
@@ -401,34 +408,32 @@ namespace Pixiview.Illust
 
         private void RefreshProgress()
         {
-            var illusts = Illusts;
-            var length = illusts.Length;
-            if (length <= 1)
+            if (pageCount <= 1)
             {
                 return;
             }
-            lock (sync)
+
+            downloaded++;
+            if (downloaded >= pageCount)
             {
-                var loading = illusts.Count(i => i.Loading);
-                if (loading <= 0)
+                MainThread.BeginInvokeOnMainThread(async () =>
                 {
-                    MainThread.BeginInvokeOnMainThread(async () =>
-                    {
-                        await progress.ProgressTo(1, 250, Easing.CubicIn);
-                        await progress.FadeTo(0, easing: Easing.CubicIn);
-                        ProgressVisible = false;
-                    });
-                }
-                else
-                {
-                    var val = (length - loading) / (float)length;
-                    MainThread.BeginInvokeOnMainThread(() =>
-                    {
-                        ViewExtensions.CancelAnimations(progress);
-                        progress.ProgressTo(val, 250, Easing.CubicIn);
-                    });
-                }
+                    await progress.ProgressTo(1, 250, Easing.CubicIn);
+                    await progress.FadeTo(0, easing: Easing.CubicIn);
+                    ProgressVisible = false;
+                });
             }
+            else
+            {
+                var val = downloaded / (float)pageCount;
+                App.DebugPrint($"download progress: {val}");
+                MainThread.BeginInvokeOnMainThread(() =>
+                {
+                    ViewExtensions.CancelAnimations(progress);
+                    progress.ProgressTo(val, 250, Easing.CubicIn);
+                });
+            }
+
         }
 
         private void TapPrevious_Tapped(object sender, EventArgs e)