diff --git a/benchmark/Prime.Extensions.Benchmarks.sh b/benchmark/Prime.Extensions.Benchmarks.sh
new file mode 100644
index 0000000..0c3688c
--- /dev/null
+++ b/benchmark/Prime.Extensions.Benchmarks.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+rm -rf BenchmarkDotNet.Artifacts
+rm -rf Prime.Extensions.Benchmarks/bin
+rm -rf Prime.Extensions.Benchmarks/obj
+
+dotnet run --project Prime.Extensions.Benchmarks/ -c release
+
+
+
diff --git a/benchmark/Prime.Extensions.Benchmarks/FindIdsBenchmarks.cs b/benchmark/Prime.Extensions.Benchmarks/FindIdsBenchmarks.cs
new file mode 100644
index 0000000..44b00e6
--- /dev/null
+++ b/benchmark/Prime.Extensions.Benchmarks/FindIdsBenchmarks.cs
@@ -0,0 +1,149 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using BenchmarkDotNet.Attributes;
+using MongoDB.Driver;
+using MongoDB.Prime.Extensions;
+using Squadron;
+
+namespace Prime.Extensions.Benchmarks
+{
+    [RPlotExporter, CategoriesColumn, RankColumn, MeanColumn, MedianColumn, MemoryDiagnoser]
+    public class FindIdsBenchmarks
+    {
+        private static MongoReplicaSetResource _mongoRsResource;
+        private static IMongoCollection<Bar> _barCollection;
+        private static IReadOnlyList<Guid> _200BarsToFind;
+        private static IReadOnlyList<Guid> _1000BarsToFind;
+        private static IReadOnlyList<Guid> _5000BarsToFind;
+        private static IReadOnlyList<Guid> _10000BarsToFind;
+
+        [GlobalSetup]
+        public void GlobalSetup()
+        {
+            InitializeOnce().GetAwaiter().GetResult();
+        }
+
+        [Benchmark()]
+        public Task FindIdsClassic200()
+        {
+            return FindClassicAsync(_200BarsToFind);
+        }
+
+        [Benchmark]
+        public Task FindIdsOptimized200()
+        {
+            return FindOptimizedAsync(_200BarsToFind);
+        }
+
+        [Benchmark()]
+        public Task FindIdsClassic1000()
+        {
+            return FindClassicAsync(_1000BarsToFind);
+        }
+
+        [Benchmark]
+        public Task FindIdsOptimized1000()
+        {
+            return FindOptimizedAsync(_1000BarsToFind);
+        }
+
+        [Benchmark()]
+        public Task FindIdsClassic5000()
+        {
+            return FindClassicAsync(_5000BarsToFind);
+        }
+
+        [Benchmark]
+        public Task FindIdsOptimized5000()
+        {
+            return FindOptimizedAsync(_5000BarsToFind);
+        }
+
+        [Benchmark()]
+        public Task FindIdsClassic10000()
+        {
+            return FindClassicAsync(_10000BarsToFind);
+        }
+
+        [Benchmark]
+        public Task FindIdsOptimized10000()
+        {
+            return FindOptimizedAsync(_10000BarsToFind);
+        }
+
+        public async Task FindOptimizedAsync(IReadOnlyList<Guid> barsToFind)
+        {
+            IDictionary<Guid, Bar> result = await _barCollection
+                .FindIdsAsync(barsToFind, bar => bar.Id);
+
+            if (result.Count != barsToFind.Count)
+                throw new Exception("WrongResult");
+        }
+
+        public async Task FindClassicAsync(IReadOnlyList<Guid> barsToFind)
+        {
+            FilterDefinition<Bar> filter =
+                Builders<Bar>.Filter.In(b => b.Id, barsToFind);
+
+            List<Bar> bars = await _barCollection
+                .Find(filter)
+                .ToListAsync();
+
+            var result = bars.ToDictionary(t => t.Id);
+
+            if (result.Count != barsToFind.Count)
+                throw new Exception("WrongResult");
+        }
+
+        private async Task InitializeOnce()
+        {
+            if (_10000BarsToFind == null)
+            {
+                _mongoRsResource = new MongoReplicaSetResource();
+
+                await _mongoRsResource.InitializeAsync();
+
+                IMongoDatabase mongoDatabase = _mongoRsResource.CreateDatabase();
+
+                _barCollection = mongoDatabase.GetCollection<Bar>();
+
+                IReadOnlyList<Bar> alldBars = CreateRandomBars(5_000_000);
+
+                await _barCollection.InsertManyAsync(alldBars);
+
+                _200BarsToFind = alldBars.Skip(500_000).Take(200).Select(bar => bar.Id).ToList();
+                _1000BarsToFind = alldBars.Skip(500_000).Take(1000).Select(bar => bar.Id).ToList();
+                _5000BarsToFind = alldBars.Skip(500_000).Take(5000).Select(bar => bar.Id).ToList();
+                _10000BarsToFind = alldBars.Skip(500_000).Take(10000).Select(bar => bar.Id).ToList();
+            }
+        }
+        
+        private static IReadOnlyList<Bar> CreateRandomBars(int count)
+        {
+            return Enumerable
+                .Range(0, count)
+                .Select(number => new Bar(
+                    Guid.NewGuid(),
+                    $"BarName-Unique-{number}",
+                    $"BarValue-{Guid.NewGuid()}"))
+                .ToList();
+        }
+
+        private class Bar
+        {
+            public Bar(Guid id, string name, string value)
+            {
+                Id = id;
+                Name = name;
+                Value = value;
+            }
+
+            public Guid Id { get; }
+
+            public string Name { get; }
+            public string Value { get; }
+        }
+    }
+}
diff --git a/benchmark/Prime.Extensions.Benchmarks/Prime.Extensions.Benchmarks.csproj b/benchmark/Prime.Extensions.Benchmarks/Prime.Extensions.Benchmarks.csproj
new file mode 100644
index 0000000..895deb8
--- /dev/null
+++ b/benchmark/Prime.Extensions.Benchmarks/Prime.Extensions.Benchmarks.csproj
@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Squadron.Mongo" Version="0.9.0" />
+  </ItemGroup>
+  
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.12.1" />
+  </ItemGroup>
+  
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Prime.Extensions\Prime.Extensions.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/benchmark/Prime.Extensions.Benchmarks/Program.cs b/benchmark/Prime.Extensions.Benchmarks/Program.cs
new file mode 100644
index 0000000..9af0db2
--- /dev/null
+++ b/benchmark/Prime.Extensions.Benchmarks/Program.cs
@@ -0,0 +1,15 @@
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Running;
+
+namespace Prime.Extensions.Benchmarks
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            BenchmarkSwitcher
+                .FromAssembly(typeof(Program).Assembly)
+                .Run(args, new DebugInProcessConfig());
+        }
+    }
+}
diff --git a/benchmark/Prime.Extensions.Benchmarks/reports/FindIdsBenchmark.Report.md b/benchmark/Prime.Extensions.Benchmarks/reports/FindIdsBenchmark.Report.md
new file mode 100644
index 0000000..69d5d64
--- /dev/null
+++ b/benchmark/Prime.Extensions.Benchmarks/reports/FindIdsBenchmark.Report.md
@@ -0,0 +1,19 @@
+``` ini
+
+BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19042
+Intel Core i7-9750H CPU 2.60GHz, 1 CPU, 12 logical and 6 physical cores
+.NET Core SDK=5.0.202
+  [Host] : .NET Core 5.0.5 (CoreCLR 5.0.521.16609, CoreFX 5.0.521.16609), X64
+
+```
+
+|                Method |      Mean |    Error |    StdDev |    Median | Rank |     Gen 0 |    Gen 1 | Gen 2 |   Allocated |
+|---------------------- |----------:|---------:|----------:|----------:|-----:|----------:|---------:|------:|------------:|
+|     FindIdsClassic200 |  10.65 ms | 0.480 ms |  1.394 ms |  10.67 ms |    1 |         - |        - |     - |    322.7 KB |
+|   FindIdsOptimized200 |  10.55 ms | 0.321 ms |  0.935 ms |  10.43 ms |    1 |   46.8750 |        - |     - |   338.72 KB |
+|    FindIdsClassic1000 |  25.45 ms | 0.580 ms |  1.684 ms |  25.29 ms |    3 |  218.7500 |  62.5000 |     - |  1372.31 KB |
+|  FindIdsOptimized1000 |  24.57 ms | 1.318 ms |  3.694 ms |  24.18 ms |    2 |  250.0000 |  93.7500 |     - |  1531.93 KB |
+|    FindIdsClassic5000 | 141.15 ms | 8.385 ms | 24.058 ms | 139.35 ms |    5 | 1000.0000 | 500.0000 |     - |   6877.5 KB |
+|  FindIdsOptimized5000 |  83.00 ms | 2.871 ms |  8.375 ms |  81.85 ms |    4 | 1142.8571 | 571.4286 |     - |  7369.99 KB |
+|   FindIdsClassic10000 | 241.54 ms | 6.473 ms | 18.469 ms | 242.59 ms |    7 | 2000.0000 | 666.6667 |     - | 13674.21 KB |
+| FindIdsOptimized10000 | 156.01 ms | 6.863 ms | 19.910 ms | 154.24 ms |    6 | 2250.0000 | 750.0000 |     - | 14622.44 KB |
diff --git a/src/MongoDB.Extensions.sln b/src/MongoDB.Extensions.sln
index 790b492..93069f7 100644
--- a/src/MongoDB.Extensions.sln
+++ b/src/MongoDB.Extensions.sln
@@ -11,9 +11,13 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Session", "Session\Session.
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Session.Tests", "Session.Tests\Session.Tests.csproj", "{7D953E6D-B34C-4724-8E4D-A968110CAC74}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Prime.Extensions", "Prime.Extensions\Prime.Extensions.csproj", "{284AF759-C10C-4C89-AFA3-F2D190115CC6}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Prime.Extensions", "Prime.Extensions\Prime.Extensions.csproj", "{284AF759-C10C-4C89-AFA3-F2D190115CC6}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Prime.Extensions.Tests", "Prime.Extensions.Tests\Prime.Extensions.Tests.csproj", "{74A9A535-5E20-4453-A670-2E37A279226C}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Prime.Extensions.Tests", "Prime.Extensions.Tests\Prime.Extensions.Tests.csproj", "{74A9A535-5E20-4453-A670-2E37A279226C}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "benchmark", "benchmark", "{73BCA034-E71E-462C-93E7-DF956BBC5E67}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Prime.Extensions.Benchmarks", "..\benchmark\Prime.Extensions.Benchmarks\Prime.Extensions.Benchmarks.csproj", "{960D6087-8C05-4B19-B7D6-78F92F7BAA3F}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -45,10 +49,17 @@ Global
 		{74A9A535-5E20-4453-A670-2E37A279226C}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{74A9A535-5E20-4453-A670-2E37A279226C}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{74A9A535-5E20-4453-A670-2E37A279226C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{960D6087-8C05-4B19-B7D6-78F92F7BAA3F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{960D6087-8C05-4B19-B7D6-78F92F7BAA3F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{960D6087-8C05-4B19-B7D6-78F92F7BAA3F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{960D6087-8C05-4B19-B7D6-78F92F7BAA3F}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{960D6087-8C05-4B19-B7D6-78F92F7BAA3F} = {73BCA034-E71E-462C-93E7-DF956BBC5E67}
+	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {1C05A190-7BC9-4DE5-A49D-D7557B01869D}
 	EndGlobalSection
diff --git a/src/Prime.Extensions/MongoCollectionFindExtensions.cs b/src/Prime.Extensions/MongoCollectionFindExtensions.cs
index a059734..823a24b 100644
--- a/src/Prime.Extensions/MongoCollectionFindExtensions.cs
+++ b/src/Prime.Extensions/MongoCollectionFindExtensions.cs
@@ -24,6 +24,11 @@ public static async Task<IDictionary<TId, TDocument>> FindIdsAsync<TId, TDocumen
         {
             int allIdsCount = idsToFind.Count();
 
+            if (allIdsCount == 0)
+            {
+                return new Dictionary<TId, TDocument>();
+            }
+
             Func<TDocument, TId> idSelectorFunc = idResultSelector.Compile();
 
             int batchPartitionsCount =