Reduce database includes where possible

osu.Game/Beatmaps/BeatmapManager.cs

@@ -246,6 +246,12 @@ namespace osu.Game.Beatmaps
             if (beatmapInfo?.BeatmapSet == null || beatmapInfo == DefaultBeatmap?.BeatmapInfo)
                 return DefaultBeatmap;
 
+            if (beatmapInfo.BeatmapSet.Files == null)
+            {
+                var info = beatmapInfo;
+                beatmapInfo = QueryBeatmap(b => b.ID == info.ID);
+            }
+
             lock (workingCache)
             {
                 var working = workingCache.FirstOrDefault(w => w.BeatmapInfo?.ID == beatmapInfo.ID);
@@ -287,13 +293,34 @@ namespace osu.Game.Beatmaps
         /// Returns a list of all usable <see cref="BeatmapSetInfo"/>s.
         /// </summary>
         /// <returns>A list of available <see cref="BeatmapSetInfo"/>.</returns>
-        public List<BeatmapSetInfo> GetAllUsableBeatmapSets() => GetAllUsableBeatmapSetsEnumerable().ToList();
+        public List<BeatmapSetInfo> GetAllUsableBeatmapSets(IncludedDetails includes = IncludedDetails.All) => GetAllUsableBeatmapSetsEnumerable(includes).ToList();
 
         /// <summary>
-        /// Returns a list of all usable <see cref="BeatmapSetInfo"/>s.
+        /// Returns a list of all usable <see cref="BeatmapSetInfo"/>s. Note that files are not populated.
         /// </summary>
+        /// <param name="includes">The level of detail to include in the returned objects.</param>
         /// <returns>A list of available <see cref="BeatmapSetInfo"/>.</returns>
-        public IQueryable<BeatmapSetInfo> GetAllUsableBeatmapSetsEnumerable() => beatmaps.ConsumableItems.Where(s => !s.DeletePending && !s.Protected);
+        public IQueryable<BeatmapSetInfo> GetAllUsableBeatmapSetsEnumerable(IncludedDetails includes)
+        {
+            IQueryable<BeatmapSetInfo> queryable;
+
+            switch (includes)
+            {
+                case IncludedDetails.Minimal:
+                    queryable = beatmaps.BeatmapSetsOverview;
+                    break;
+
+                case IncludedDetails.AllButFiles:
+                    queryable = beatmaps.BeatmapSetsWithoutFiles;
+                    break;
+
+                default:
+                    queryable = beatmaps.ConsumableItems;
+                    break;
+            }
+
+            return queryable.Where(s => !s.DeletePending && !s.Protected);
+        }
 
         /// <summary>
         /// Perform a lookup query on available <see cref="BeatmapSetInfo"/>s.
@@ -482,4 +509,25 @@ namespace osu.Game.Beatmaps
             }
         }
     }
+
+    /// <summary>
+    /// The level of detail to include in database results.
+    /// </summary>
+    public enum IncludedDetails
+    {
+        /// <summary>
+        /// Only include beatmap difficulties and set level metadata.
+        /// </summary>
+        Minimal,
+
+        /// <summary>
+        /// Include all difficulties, rulesets, difficulty metadata but no files.
+        /// </summary>
+        AllButFiles,
+
+        /// <summary>
+        /// Include everything.
+        /// </summary>
+        All
+    }
 }

osu.Game/Beatmaps/BeatmapStore.cs

@@ -87,6 +87,18 @@ namespace osu.Game.Beatmaps
             base.Purge(items, context);
         }
 
+        public IQueryable<BeatmapSetInfo> BeatmapSetsOverview => ContextFactory.Get().BeatmapSetInfo
+                                                                               .Include(s => s.Metadata)
+                                                                               .Include(s => s.Beatmaps)
+                                                                               .AsNoTracking();
+
+        public IQueryable<BeatmapSetInfo> BeatmapSetsWithoutFiles => ContextFactory.Get().BeatmapSetInfo
+                                                                                   .Include(s => s.Metadata)
+                                                                                   .Include(s => s.Beatmaps).ThenInclude(s => s.Ruleset)
+                                                                                   .Include(s => s.Beatmaps).ThenInclude(b => b.BaseDifficulty)
+                                                                                   .Include(s => s.Beatmaps).ThenInclude(b => b.Metadata)
+                                                                                   .AsNoTracking();
+
         public IQueryable<BeatmapInfo> Beatmaps =>
             ContextFactory.Get().BeatmapInfo
                           .Include(b => b.BeatmapSet).ThenInclude(s => s.Metadata)

osu.Game/Overlays/MusicController.cs

@@ -66,7 +66,7 @@ namespace osu.Game.Overlays
             beatmaps.ItemAdded += handleBeatmapAdded;
             beatmaps.ItemRemoved += handleBeatmapRemoved;
 
-            beatmapSets.AddRange(beatmaps.GetAllUsableBeatmapSets().OrderBy(_ => RNG.Next()));
+            beatmapSets.AddRange(beatmaps.GetAllUsableBeatmapSets(IncludedDetails.Minimal).OrderBy(_ => RNG.Next()));
         }
 
         protected override void LoadComplete()

osu.Game/Screens/Menu/IntroScreen.cs

@@ -73,7 +73,7 @@ namespace osu.Game.Screens.Menu
 
             if (!MenuMusic.Value)
             {
-                var sets = beatmaps.GetAllUsableBeatmapSets();
+                var sets = beatmaps.GetAllUsableBeatmapSets(IncludedDetails.Minimal);
                 if (sets.Count > 0)
                     setInfo = beatmaps.QueryBeatmapSet(s => s.ID == sets[RNG.Next(0, sets.Count - 1)].ID);
             }

osu.Game/Screens/Select/BeatmapCarousel.cs

@@ -169,7 +169,7 @@ namespace osu.Game.Screens.Select
             loadBeatmapSets(GetLoadableBeatmaps());
         }
 
-        protected virtual IEnumerable<BeatmapSetInfo> GetLoadableBeatmaps() => beatmaps.GetAllUsableBeatmapSetsEnumerable();
+        protected virtual IEnumerable<BeatmapSetInfo> GetLoadableBeatmaps() => beatmaps.GetAllUsableBeatmapSetsEnumerable(IncludedDetails.AllButFiles);
 
         public void RemoveBeatmapSet(BeatmapSetInfo beatmapSet) => Schedule(() =>
         {

osu.Game/Screens/Select/SongSelect.cs

@@ -286,7 +286,7 @@ namespace osu.Game.Screens.Select
                 Schedule(() =>
                 {
                     // if we have no beatmaps but osu-stable is found, let's prompt the user to import.
-                    if (!beatmaps.GetAllUsableBeatmapSetsEnumerable().Any() && beatmaps.StableInstallationAvailable)
+                    if (!beatmaps.GetAllUsableBeatmapSetsEnumerable(IncludedDetails.Minimal).Any() && beatmaps.StableInstallationAvailable)
                     {
                         dialogOverlay.Push(new ImportFromStablePopup(() =>
                         {