diff --git a/backend/tests/Squidex.Infrastructure.Tests/EventSourcing/MongoParallelInsertTests.cs b/backend/tests/Squidex.Infrastructure.Tests/EventSourcing/MongoParallelInsertTests.cs
new file mode 100644
index 000000000..42cd67a36
--- /dev/null
+++ b/backend/tests/Squidex.Infrastructure.Tests/EventSourcing/MongoParallelInsertTests.cs
@@ -0,0 +1,145 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using FakeItEasy;
+using Squidex.Infrastructure.EventSourcing.Grains;
+using Squidex.Infrastructure.Log;
+using Squidex.Infrastructure.Orleans;
+using Squidex.Infrastructure.Reflection;
+using Squidex.Infrastructure.TestHelpers;
+using Xunit;
+
+#pragma warning disable SA1300 // Element should begin with upper-case letter
+
+namespace Squidex.Infrastructure.EventSourcing
+{
+    [Trait("Category", "Dependencies")]
+    public sealed class MongoParallelInsertTests : IClassFixture<MongoEventStoreFixture>
+    {
+        private readonly IGrainState<EventConsumerState> grainState = A.Fake<IGrainState<EventConsumerState>>();
+        private readonly ISemanticLog log = A.Fake<ISemanticLog>();
+        private readonly IEventDataFormatter eventDataFormatter;
+
+        public MongoEventStoreFixture _ { get; }
+
+        public sealed class MyEventConsumerGrain : EventConsumerGrain
+        {
+            public MyEventConsumerGrain(
+                EventConsumerFactory eventConsumerFactory,
+                IGrainState<EventConsumerState> state,
+                IEventStore eventStore,
+                IEventDataFormatter eventDataFormatter,
+                ISemanticLog log)
+                : base(eventConsumerFactory, state, eventStore, eventDataFormatter, log)
+            {
+            }
+
+            protected override IEventConsumerGrain GetSelf()
+            {
+                return this;
+            }
+
+            protected override IEventSubscription CreateSubscription(IEventStore store, IEventSubscriber subscriber, string? filter, string? position)
+            {
+                return store.CreateSubscription(subscriber, filter, position);
+            }
+        }
+
+        public class MyEvent : IEvent
+        {
+        }
+
+        public sealed class MyEventConsumer : IEventConsumer
+        {
+            private readonly HashSet<Guid> uniqueReceivedEvents = new HashSet<Guid>();
+            private readonly TaskCompletionSource<bool> tcs = new TaskCompletionSource<bool>();
+            private readonly int expectedCount;
+
+            public string Name => "Test";
+
+            public string EventsFilter => ".*";
+
+            public int Received { get; set; }
+
+            public Task Completed => tcs.Task;
+
+            public MyEventConsumer(int expectedCount)
+            {
+                this.expectedCount = expectedCount;
+            }
+
+            public Task ClearAsync()
+            {
+                return Task.CompletedTask;
+            }
+
+            public bool Handles(StoredEvent @event)
+            {
+                return true;
+            }
+
+            public Task On(Envelope<IEvent> @event)
+            {
+                Received++;
+
+                uniqueReceivedEvents.Add(@event.Headers.CommitId());
+
+                if (uniqueReceivedEvents.Count == expectedCount)
+                {
+                    tcs.TrySetResult(true);
+                }
+
+                return Task.CompletedTask;
+            }
+        }
+
+        public MongoParallelInsertTests(MongoEventStoreFixture fixture)
+        {
+            _ = fixture;
+
+            var typeNameRegistry = new TypeNameRegistry().Map(typeof(MyEvent), "My");
+
+            eventDataFormatter = new DefaultEventDataFormatter(typeNameRegistry, JsonHelper.DefaultSerializer);
+        }
+
+        [Fact]
+        public async Task Should_insert_and_retrieve_parallel()
+        {
+            var expectedEvents = 10 * 1000;
+
+            var consumer = new MyEventConsumer(expectedEvents);
+            var consumerGrain = new MyEventConsumerGrain(_ => consumer, grainState, _.EventStore, eventDataFormatter, log);
+
+            await consumerGrain.ActivateAsync(consumer.Name);
+            await consumerGrain.ActivateAsync();
+
+            Parallel.For(0, 10, x =>
+            {
+                for (var i = 0; i < 1000; i++)
+                {
+                    var commitId = Guid.NewGuid();
+
+                    var data = eventDataFormatter.ToEventData(Envelope.Create<IEvent>(new MyEvent()), commitId);
+
+                    _.EventStore.AppendAsync(commitId, commitId.ToString(), new[] { data }).Wait();
+                }
+            });
+
+            var timeout = Task.Delay(5 * 1000 * 60);
+
+            var result = Task.WhenAny(timeout, consumer.Completed);
+
+            await result;
+
+            Assert.NotSame(result, timeout);
+            Assert.Equal(expectedEvents, consumer.Received);
+        }
+    }
+}