diff --git a/MongoDB.Entities/Commands/Update.cs b/MongoDB.Entities/Commands/Update.cs
index 30095a537..dd6613a58 100644
--- a/MongoDB.Entities/Commands/Update.cs
+++ b/MongoDB.Entities/Commands/Update.cs
@@ -315,8 +315,8 @@ public Update<T> WithArrayFilter(string filter)
 
             options.ArrayFilters =
                 options.ArrayFilters == null
-                ? new List<ArrayFilterDefinition>() { def }
-                : options.ArrayFilters.Concat(new List<ArrayFilterDefinition> { def });
+                ? new[] { def }
+                : options.ArrayFilters.Concat(new[] { def });
 
             return this;
         }
diff --git a/MongoDB.Entities/Commands/UpdateAndGet.cs b/MongoDB.Entities/Commands/UpdateAndGet.cs
index a0aae1746..6457607e9 100644
--- a/MongoDB.Entities/Commands/UpdateAndGet.cs
+++ b/MongoDB.Entities/Commands/UpdateAndGet.cs
@@ -283,8 +283,8 @@ public UpdateAndGet<T, TProjection> WithArrayFilter(string filter)
 
             options.ArrayFilters =
                 options.ArrayFilters == null
-                ? new List<ArrayFilterDefinition>() { def }
-                : options.ArrayFilters.Concat(new List<ArrayFilterDefinition> { def });
+                ? new[] { def }
+                : options.ArrayFilters.Concat(new[] { def });
 
             return this;
         }
diff --git a/MongoDB.Entities/Core/Watcher.cs b/MongoDB.Entities/Core/Watcher.cs
index d90308566..eb91e54bd 100644
--- a/MongoDB.Entities/Core/Watcher.cs
+++ b/MongoDB.Entities/Core/Watcher.cs
@@ -141,7 +141,7 @@ private void Init(
             resume = autoResume;
             cancelToken = cancellation;
 
-            var ops = new List<ChangeStreamOperationType>() { ChangeStreamOperationType.Invalidate };
+            var ops = new List<ChangeStreamOperationType>(3) { ChangeStreamOperationType.Invalidate };
 
             if ((eventTypes & EventType.Created) != 0)
                 ops.Add(ChangeStreamOperationType.Insert);
diff --git a/MongoDB.Entities/MongoDB.Entities.csproj b/MongoDB.Entities/MongoDB.Entities.csproj
index ebdbdd3dd..59d2a41bb 100644
--- a/MongoDB.Entities/MongoDB.Entities.csproj
+++ b/MongoDB.Entities/MongoDB.Entities.csproj
@@ -8,13 +8,14 @@
     <Description>A data access library for MongoDB with an elegant api, LINQ support and built-in entity relationship management.</Description>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageProjectUrl>https://mongodb-entities.com</PackageProjectUrl>
-    <Version>20.16.0-beta4</Version>
+    <Version>20.16.0-beta5</Version>
     <Copyright>Đĵ ΝιΓΞΗΛψΚ</Copyright>
     <PackageReleaseNotes>- added DB.InsertAsync() method
 - added method for deleting join collections
 - optimized internal performance by using lists instead of hashsets
 - optimized Cache&lt;T&gt; class
-- optimized Watcher class</PackageReleaseNotes>
+- optimized Watcher class
+- various other minor performance optimizations</PackageReleaseNotes>
     <PackageId>MongoDB.Entities</PackageId>
     <Product>MongoDB.Entities</Product>
     <RepositoryUrl>https://github.com/dj-nitehawk/MongoDB.Entities</RepositoryUrl>
diff --git a/MongoDB.Entities/Relationships/Many.Add.cs b/MongoDB.Entities/Relationships/Many.Add.cs
index 85456eac3..8f36cfdc9 100644
--- a/MongoDB.Entities/Relationships/Many.Add.cs
+++ b/MongoDB.Entities/Relationships/Many.Add.cs
@@ -55,7 +55,7 @@ public Task AddAsync(IEnumerable<string> childIDs, IClientSessionHandle session
         {
             parent.ThrowIfUnsaved();
 
-            var models = new List<WriteModel<JoinRecord>>();
+            var models = new List<WriteModel<JoinRecord>>(childIDs.Count());
             foreach (var cid in childIDs)
             {
                 cid.ThrowIfUnsaved();