diff --git a/src/Speckle.Sdk/Api/Operations/Operations.Receive.cs b/src/Speckle.Sdk/Api/Operations/Operations.Receive.cs
index 3ab6670c..bc12f5d0 100644
--- a/src/Speckle.Sdk/Api/Operations/Operations.Receive.cs
+++ b/src/Speckle.Sdk/Api/Operations/Operations.Receive.cs
@@ -143,7 +143,9 @@ public static partial class Operations
     }
 
     // Shoot out the total children count, wasteful
-    var count = (await ClosureParser.GetClosuresAsync(objString).ConfigureAwait(false)).Count;
+    var count = (
+      await ClosureParser.GetClosuresAsync(objString, localTransport.CancellationToken).ConfigureAwait(false)
+    ).Count;
 
     onTotalChildrenCountKnown?.Invoke(count);
 
diff --git a/src/Speckle.Sdk/Serialisation/Utilities/ClosureParser.cs b/src/Speckle.Sdk/Serialisation/Utilities/ClosureParser.cs
index 3fb4b37b..70598054 100644
--- a/src/Speckle.Sdk/Serialisation/Utilities/ClosureParser.cs
+++ b/src/Speckle.Sdk/Serialisation/Utilities/ClosureParser.cs
@@ -5,24 +5,27 @@ namespace Speckle.Sdk.Serialisation.Utilities;
 
 public static class ClosureParser
 {
-  public static async Task<IReadOnlyList<(string, int)>> GetClosuresAsync(string rootObjectJson)
+  public static async Task<IReadOnlyList<(string, int)>> GetClosuresAsync(
+    string rootObjectJson,
+    CancellationToken cancellationToken = default
+  )
   {
     try
     {
       using JsonTextReader reader = new(new StringReader(rootObjectJson));
-      reader.Read();
+      await reader.ReadAsync(cancellationToken).ConfigureAwait(false);
       while (reader.TokenType != JsonToken.EndObject)
       {
         switch (reader.TokenType)
         {
           case JsonToken.StartObject:
           {
-            var closureList = await ReadObjectAsync(reader).ConfigureAwait(false);
+            var closureList = await ReadObjectAsync(reader, cancellationToken).ConfigureAwait(false);
             return closureList;
           }
           default:
-            reader.Read();
-            reader.Skip();
+            await reader.ReadAsync(cancellationToken).ConfigureAwait(false);
+            await reader.SkipAsync(cancellationToken).ConfigureAwait(false);
             break;
         }
       }
@@ -31,12 +34,17 @@ public static class ClosureParser
     return [];
   }
 
-  public static async Task<IEnumerable<string>> GetChildrenIdsAsync(string rootObjectJson) =>
-    (await GetClosuresAsync(rootObjectJson).ConfigureAwait(false)).Select(x => x.Item1);
+  public static async Task<IEnumerable<string>> GetChildrenIdsAsync(
+    string rootObjectJson,
+    CancellationToken cancellationToken = default
+  ) => (await GetClosuresAsync(rootObjectJson, cancellationToken).ConfigureAwait(false)).Select(x => x.Item1);
 
-  private static async Task<IReadOnlyList<(string, int)>> ReadObjectAsync(JsonTextReader reader)
+  private static async Task<IReadOnlyList<(string, int)>> ReadObjectAsync(
+    JsonTextReader reader,
+    CancellationToken cancellationToken
+  )
   {
-    await reader.ReadAsync().ConfigureAwait(false);
+    await reader.ReadAsync(cancellationToken).ConfigureAwait(false);
     while (reader.TokenType != JsonToken.EndObject)
     {
       switch (reader.TokenType)
@@ -45,19 +53,19 @@ public static class ClosureParser
           {
             if (reader.Value as string == "__closure")
             {
-              await reader.ReadAsync().ConfigureAwait(false); //goes to prop vale
+              await reader.ReadAsync(cancellationToken).ConfigureAwait(false); //goes to prop vale
               var closureList = await ReadClosureEnumerableAsync(reader).ConfigureAwait(false);
               return closureList;
             }
-            await reader.ReadAsync().ConfigureAwait(false); //goes to prop vale
-            await reader.SkipAsync().ConfigureAwait(false);
-            await reader.ReadAsync().ConfigureAwait(false); //goes to next
+            await reader.ReadAsync(cancellationToken).ConfigureAwait(false); //goes to prop vale
+            await reader.SkipAsync(cancellationToken).ConfigureAwait(false);
+            await reader.ReadAsync(cancellationToken).ConfigureAwait(false); //goes to next
           }
           break;
         default:
-          await reader.ReadAsync().ConfigureAwait(false);
-          await reader.SkipAsync().ConfigureAwait(false);
-          await reader.ReadAsync().ConfigureAwait(false);
+          await reader.ReadAsync(cancellationToken).ConfigureAwait(false);
+          await reader.SkipAsync(cancellationToken).ConfigureAwait(false);
+          await reader.ReadAsync(cancellationToken).ConfigureAwait(false);
           break;
       }
     }
diff --git a/src/Speckle.Sdk/Transports/ServerTransport.cs b/src/Speckle.Sdk/Transports/ServerTransport.cs
index c544087f..517e8bad 100644
--- a/src/Speckle.Sdk/Transports/ServerTransport.cs
+++ b/src/Speckle.Sdk/Transports/ServerTransport.cs
@@ -126,7 +126,9 @@ public sealed class ServerTransport : IServerTransport
     api.CancellationToken = CancellationToken;
 
     string? rootObjectJson = await api.DownloadSingleObject(StreamId, id, OnProgressAction).ConfigureAwait(false);
-    var allIds = (await ClosureParser.GetChildrenIdsAsync(rootObjectJson.NotNull()).ConfigureAwait(false)).ToList();
+    var allIds = (
+      await ClosureParser.GetChildrenIdsAsync(rootObjectJson.NotNull(), CancellationToken).ConfigureAwait(false)
+    ).ToList();
 
     var childrenIds = allIds.Where(x => !x.Contains("blob:"));
     var blobIds = allIds.Where(x => x.Contains("blob:")).Select(x => x.Remove(0, 5));
diff --git a/src/Speckle.Sdk/Transports/TransportHelpers.cs b/src/Speckle.Sdk/Transports/TransportHelpers.cs
index 5c239140..7111d193 100644
--- a/src/Speckle.Sdk/Transports/TransportHelpers.cs
+++ b/src/Speckle.Sdk/Transports/TransportHelpers.cs
@@ -30,7 +30,7 @@ public static class TransportHelpers
 
     targetTransport.SaveObject(id, parent);
 
-    var closures = (await ClosureParser.GetChildrenIdsAsync(parent).ConfigureAwait(false)).ToList();
+    var closures = (await ClosureParser.GetChildrenIdsAsync(parent, cancellationToken).ConfigureAwait(false)).ToList();
 
     onTotalChildrenCountKnown?.Invoke(closures.Count);