diff --git a/Source/IGListAdapterUpdater.m b/Source/IGListAdapterUpdater.m
index 75229b8b..66d68831 100644
--- a/Source/IGListAdapterUpdater.m
+++ b/Source/IGListAdapterUpdater.m
@@ -15,6 +15,7 @@
 #import <IGListKit/IGListDiff.h>
 
 #import "UICollectionView+IGListBatchUpdateData.h"
+#import "IGListIndexSetResultInternal.h"
 #import "IGListMoveIndexPathInternal.h"
 #import "IGListReloadIndexPath.h"
 
@@ -167,16 +168,21 @@ static NSArray *objectsWithDuplicateIdentifiersRemoved(NSArray<id<IGListDiffable
         }
     };
 
+    void (^reloadDataFallback)() = ^{
+        executeUpdateBlocks();
+        [self cleanStateAfterUpdates];
+        [self performBatchUpdatesItemBlockApplied];
+        [collectionView reloadData];
+        [collectionView layoutIfNeeded];
+        executeCompletionBlocks(YES);
+    };
+
     // if the collection view isn't in a visible window, skip diffing and batch updating. execute all transition blocks,
     // reload data, execute completion blocks, and get outta here
     const BOOL iOS83OrLater = (NSFoundationVersionNumber >= NSFoundationVersionNumber_iOS_8_3);
     if (iOS83OrLater && self.allowsBackgroundReloading && collectionView.window == nil) {
         [self beginPerformBatchUpdatesToObjects:toObjects];
-        executeUpdateBlocks();
-        [self cleanStateAfterUpdates];
-        [self performBatchUpdatesItemBlockApplied];
-        [collectionView reloadData];
-        executeCompletionBlocks(YES);
+        reloadDataFallback();
         return;
     }
 
@@ -217,7 +223,9 @@ static NSArray *objectsWithDuplicateIdentifiersRemoved(NSArray<id<IGListDiffable
     void (^performUpdate)(IGListIndexSetResult *) = ^(IGListIndexSetResult *result){
         @try {
             [delegate listAdapterUpdater:self willPerformBatchUpdatesWithCollectionView:collectionView];
-            if (animated) {
+            if (result.changeCount > 100 && IGListExperimentEnabled(experiments, IGListExperimentReloadDataFallback)) {
+                reloadDataFallback();
+            } else if (animated) {
                 [collectionView performBatchUpdates:^{
                     batchUpdatesBlock(result);
                 } completion:batchUpdatesCompletionBlock];
diff --git a/Tests/IGListAdapterE2ETests.m b/Tests/IGListAdapterE2ETests.m
index 9dcf810c..79856ed1 100644
--- a/Tests/IGListAdapterE2ETests.m
+++ b/Tests/IGListAdapterE2ETests.m
@@ -1521,4 +1521,25 @@
     [self waitForExpectationsWithTimeout:30 handler:nil];
 }
 
+- (void)test_whenMassiveUpdate_thatUpdateApplied {
+    // init empty
+    [self setupWithObjects:@[]];
+
+    ((IGListAdapterUpdater *)self.updater).experiments = IGListExperimentReloadDataFallback;
+
+    NSMutableArray *objects = [NSMutableArray new];
+    for (NSInteger i = 0; i < 3000; i++) {
+        [objects addObject:genTestObject(@(i + 1), @4)];
+    }
+    self.dataSource.objects = objects;
+
+    XCTestExpectation *expectation = genExpectation;
+    [self.adapter performUpdatesAnimated:YES completion:^(BOOL finished) {
+        XCTAssertEqual([self.collectionView numberOfSections], 3000);
+        [expectation fulfill];
+    }];
+
+    [self waitForExpectationsWithTimeout:30 handler:nil];
+}
+
 @end