diff --git a/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETCore.approved.txt b/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETCore.approved.txt
index c0299011..f17a4868 100644
--- a/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETCore.approved.txt
+++ b/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETCore.approved.txt
@@ -30,6 +30,7 @@ Octopus.Client
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.IOctopusAsyncRepository Repository { get; }
     Octopus.Client.Model.RootResource RootDocument { get; }
+    Task<IOctopusAsyncClient> AsUser(String, Octopus.Client.OctopusClientOptions)
     Task<TResource> Create(String, Octopus.Client.TResource, Object)
     Task<TResource> Create(String, Octopus.Client.TResource, CancellationToken)
     Task<TResource> Create(String, Octopus.Client.TResource, Object, CancellationToken)
@@ -98,6 +99,7 @@ Octopus.Client
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.IOctopusRepository Repository { get; }
     Octopus.Client.Model.RootResource RootDocument { get; }
+    Octopus.Client.IOctopusClient AsUser(String, Octopus.Client.OctopusClientOptions)
     Octopus.Client.TResource Create(String, Octopus.Client.TResource, Object)
     Octopus.Client.TResponse Create(String, Octopus.Client.TCommand, Object)
     void Delete(String, Object, Object)
@@ -169,6 +171,10 @@ Octopus.Client
     Octopus.Client.IOctopusSystemRepository
   {
   }
+  interface IOctopusServerRootResourceCache
+  {
+    Octopus.Client.Model.RootResource CachedRootResource { get; set; }
+  }
   interface IOctopusSpaceAsyncRepository
     Octopus.Client.IOctopusCommonAsyncRepository
   {
@@ -303,6 +309,7 @@ Octopus.Client
   class OctopusAsyncClient
     Octopus.Client.IOctopusAsyncClient
     IDisposable
+    Octopus.Client.IOctopusServerRootResourceCache
   {
     event Action<HttpResponseMessage> AfterReceivedHttpResponse
     event Action<HttpRequestMessage> BeforeSendingHttpRequest
@@ -311,6 +318,7 @@ Octopus.Client
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.IOctopusAsyncRepository Repository { get; }
     Octopus.Client.Model.RootResource RootDocument { get; }
+    Task<IOctopusAsyncClient> AsUser(String, Octopus.Client.OctopusClientOptions)
     static Task<IOctopusAsyncClient> Create(Octopus.Client.OctopusServerEndpoint, Octopus.Client.OctopusClientOptions)
     Task<TResource> Create(String, Octopus.Client.TResource, Object)
     Task<TResource> Create(String, Octopus.Client.TResource, CancellationToken)
@@ -451,6 +459,7 @@ Octopus.Client
     Octopus.Client.IHttpOctopusClient
     Octopus.Client.IOctopusClient
     IDisposable
+    Octopus.Client.IOctopusServerRootResourceCache
   {
     event Action<WebResponse> AfterReceivingHttpResponse
     event Action<WebRequest> BeforeSendingHttpRequest
@@ -460,6 +469,7 @@ Octopus.Client
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.IOctopusRepository Repository { get; }
     Octopus.Client.Model.RootResource RootDocument { get; }
+    Octopus.Client.IOctopusClient AsUser(String, Octopus.Client.OctopusClientOptions)
     Octopus.Client.TResource Create(String, Octopus.Client.TResource, Object)
     Octopus.Client.TResponse Create(String, Octopus.Client.TCommand, Object)
     void Delete(String, Object, Object)
@@ -618,6 +628,7 @@ Octopus.Client
     Octopus.Client.TResponseResource ResponseResource { get; }
   }
   class OctopusServerEndpoint
+    Octopus.Client.IOctopusServerRootResourceCache
   {
     .ctor(String)
     .ctor(String, String)
@@ -625,6 +636,7 @@ Octopus.Client
     .ctor(Octopus.Client.ILinkResolver, String, ICredentials)
     String ApiKey { get; }
     String BearerToken { get; }
+    Octopus.Client.Model.RootResource CachedRootResource { get; set; }
     ICredentials Credentials { get; }
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.ILinkResolver OctopusServer { get; }
diff --git a/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETFramework.approved.txt b/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETFramework.approved.txt
index 104f9d15..01340768 100644
--- a/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETFramework.approved.txt
+++ b/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETFramework.approved.txt
@@ -30,6 +30,7 @@ Octopus.Client
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.IOctopusAsyncRepository Repository { get; }
     Octopus.Client.Model.RootResource RootDocument { get; }
+    Task<IOctopusAsyncClient> AsUser(String, Octopus.Client.OctopusClientOptions)
     Task<TResource> Create(String, Octopus.Client.TResource, Object)
     Task<TResource> Create(String, Octopus.Client.TResource, CancellationToken)
     Task<TResource> Create(String, Octopus.Client.TResource, Object, CancellationToken)
@@ -98,6 +99,7 @@ Octopus.Client
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.IOctopusRepository Repository { get; }
     Octopus.Client.Model.RootResource RootDocument { get; }
+    Octopus.Client.IOctopusClient AsUser(String, Octopus.Client.OctopusClientOptions)
     Octopus.Client.TResource Create(String, Octopus.Client.TResource, Object)
     Octopus.Client.TResponse Create(String, Octopus.Client.TCommand, Object)
     void Delete(String, Object, Object)
@@ -169,6 +171,10 @@ Octopus.Client
     Octopus.Client.IOctopusSystemRepository
   {
   }
+  interface IOctopusServerRootResourceCache
+  {
+    Octopus.Client.Model.RootResource CachedRootResource { get; set; }
+  }
   interface IOctopusSpaceAsyncRepository
     Octopus.Client.IOctopusCommonAsyncRepository
   {
@@ -303,6 +309,7 @@ Octopus.Client
   class OctopusAsyncClient
     Octopus.Client.IOctopusAsyncClient
     IDisposable
+    Octopus.Client.IOctopusServerRootResourceCache
   {
     event Action<HttpResponseMessage> AfterReceivedHttpResponse
     event Action<HttpRequestMessage> BeforeSendingHttpRequest
@@ -311,6 +318,7 @@ Octopus.Client
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.IOctopusAsyncRepository Repository { get; }
     Octopus.Client.Model.RootResource RootDocument { get; }
+    Task<IOctopusAsyncClient> AsUser(String, Octopus.Client.OctopusClientOptions)
     static Task<IOctopusAsyncClient> Create(Octopus.Client.OctopusServerEndpoint, Octopus.Client.OctopusClientOptions)
     Task<TResource> Create(String, Octopus.Client.TResource, Object)
     Task<TResource> Create(String, Octopus.Client.TResource, CancellationToken)
@@ -451,6 +459,7 @@ Octopus.Client
     Octopus.Client.IHttpOctopusClient
     Octopus.Client.IOctopusClient
     IDisposable
+    Octopus.Client.IOctopusServerRootResourceCache
   {
     event Action<WebResponse> AfterReceivingHttpResponse
     event Action<WebRequest> BeforeSendingHttpRequest
@@ -460,6 +469,7 @@ Octopus.Client
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.IOctopusRepository Repository { get; }
     Octopus.Client.Model.RootResource RootDocument { get; }
+    Octopus.Client.IOctopusClient AsUser(String, Octopus.Client.OctopusClientOptions)
     Octopus.Client.TResource Create(String, Octopus.Client.TResource, Object)
     Octopus.Client.TResponse Create(String, Octopus.Client.TCommand, Object)
     void Delete(String, Object, Object)
@@ -616,6 +626,7 @@ Octopus.Client
     Octopus.Client.TResponseResource ResponseResource { get; }
   }
   class OctopusServerEndpoint
+    Octopus.Client.IOctopusServerRootResourceCache
   {
     .ctor(String)
     .ctor(String, String)
@@ -623,6 +634,7 @@ Octopus.Client
     .ctor(Octopus.Client.ILinkResolver, String, ICredentials)
     String ApiKey { get; }
     String BearerToken { get; }
+    Octopus.Client.Model.RootResource CachedRootResource { get; set; }
     ICredentials Credentials { get; }
     Boolean IsUsingSecureConnection { get; }
     Octopus.Client.ILinkResolver OctopusServer { get; }
diff --git a/source/Octopus.Server.Client/IOctopusAsyncClient.cs b/source/Octopus.Server.Client/IOctopusAsyncClient.cs
index 7edacaa2..81dab541 100644
--- a/source/Octopus.Server.Client/IOctopusAsyncClient.cs
+++ b/source/Octopus.Server.Client/IOctopusAsyncClient.cs
@@ -938,6 +938,8 @@ Task<TResponse> Create<TCommand, TResponse>(string path, TCommand command, objec
         /// <returns></returns>
         Task SignOut(CancellationToken cancellationToken);
 
+        Task<IOctopusAsyncClient> AsUser(string apiKey, OctopusClientOptions options = null);
+
         /// <summary>
         /// Get a repository for the given space
         /// </summary>
diff --git a/source/Octopus.Server.Client/IOctopusClient.cs b/source/Octopus.Server.Client/IOctopusClient.cs
index dcdd222f..f4904f43 100644
--- a/source/Octopus.Server.Client/IOctopusClient.cs
+++ b/source/Octopus.Server.Client/IOctopusClient.cs
@@ -410,6 +410,7 @@ public interface IOctopusClient : IDisposable
         /// Sign out
         /// </summary>
         void SignOut();
+        IOctopusClient AsUser(string apiKey, OctopusClientOptions options = null);
         IOctopusSpaceRepository ForSpace(SpaceResource space);
         IOctopusSystemRepository ForSystem();
 
diff --git a/source/Octopus.Server.Client/IOctopusServerRootResourceCache.cs b/source/Octopus.Server.Client/IOctopusServerRootResourceCache.cs
new file mode 100644
index 00000000..60367630
--- /dev/null
+++ b/source/Octopus.Server.Client/IOctopusServerRootResourceCache.cs
@@ -0,0 +1,8 @@
+using Octopus.Client.Model;
+
+namespace Octopus.Client;
+
+public interface IOctopusServerRootResourceCache
+{
+    RootResource CachedRootResource { get; set; }
+}
\ No newline at end of file
diff --git a/source/Octopus.Server.Client/OctopusAsyncClient.cs b/source/Octopus.Server.Client/OctopusAsyncClient.cs
index 64e2773f..08fc5934 100644
--- a/source/Octopus.Server.Client/OctopusAsyncClient.cs
+++ b/source/Octopus.Server.Client/OctopusAsyncClient.cs
@@ -24,7 +24,7 @@ namespace Octopus.Client
     /// <summary>
     /// The Octopus Deploy RESTful HTTP API client.
     /// </summary>
-    public class OctopusAsyncClient : IOctopusAsyncClient
+    public class OctopusAsyncClient : IOctopusAsyncClient, IOctopusServerRootResourceCache
     {
         private static readonly ILog Logger = LogProvider.For<OctopusAsyncClient>();
      
@@ -125,6 +125,8 @@ private bool IgnoreServerCertificateCallback(HttpRequestMessage message, X509Cer
             return false;
         }
 
+        public async Task<IOctopusAsyncClient> AsUser(string apiKey, OctopusClientOptions options = null) => await Create(serverEndpoint.AsUser(apiKey), options);
+
         public IOctopusSpaceAsyncRepository ForSpace(SpaceResource space)
         {
             ValidateSpaceId(space);
@@ -271,7 +273,13 @@ public async Task SignOut(CancellationToken cancellationToken)
         /// that it is only requested once for
         /// the current <see cref="IOctopusAsyncClient" />.
         /// </summary>
-        public RootResource RootDocument => Repository.LoadRootDocument().GetAwaiter().GetResult();
+        public RootResource RootDocument => (this as IOctopusServerRootResourceCache)?.CachedRootResource ?? Repository.LoadRootDocument().GetAwaiter().GetResult();
+
+        RootResource IOctopusServerRootResourceCache.CachedRootResource
+        {
+            get => serverEndpoint.CachedRootResource;
+            set => serverEndpoint.CachedRootResource = value;
+        }
 
         /// <summary>
         /// Occurs when a request is about to be sent.
diff --git a/source/Octopus.Server.Client/OctopusAsyncRepository.cs b/source/Octopus.Server.Client/OctopusAsyncRepository.cs
index efc77daf..36dd070f 100644
--- a/source/Octopus.Server.Client/OctopusAsyncRepository.cs
+++ b/source/Octopus.Server.Client/OctopusAsyncRepository.cs
@@ -235,6 +235,11 @@ public async Task<string> Link(string name)
 
         private async Task<RootResource> LoadRootDocumentInner(CancellationToken cancellationToken)
         {
+            if (Client is IOctopusServerRootResourceCache { CachedRootResource: { } rootResource })
+            {
+                return rootResource;
+            }
+
             var watch = Stopwatch.StartNew();
             Exception lastError = null;
 
@@ -285,7 +290,12 @@ private async Task<RootResource> LoadRootDocumentInner(CancellationToken cancell
 
             if (current < min || current > max)
                 throw new UnsupportedApiVersionException($"This Octopus Deploy server uses a newer API specification ({rootDocument.ApiVersion}) than this tool can handle ({ApiConstants.SupportedApiSchemaVersionMin} to {ApiConstants.SupportedApiSchemaVersionMax}). Please check for updates to this tool.");
-            
+
+            if (Client is IOctopusServerRootResourceCache cache)
+            {
+                cache.CachedRootResource = rootDocument;
+            }
+
             return rootDocument;
         }
 
diff --git a/source/Octopus.Server.Client/OctopusClient.cs b/source/Octopus.Server.Client/OctopusClient.cs
index aa33e29b..2afc8e43 100644
--- a/source/Octopus.Server.Client/OctopusClient.cs
+++ b/source/Octopus.Server.Client/OctopusClient.cs
@@ -20,7 +20,7 @@ namespace Octopus.Client
     /// <summary>
     /// The Octopus Deploy RESTful HTTP API client.
     /// </summary>
-    public class OctopusClient : IHttpOctopusClient
+    public class OctopusClient : IHttpOctopusClient, IOctopusServerRootResourceCache
     {
         private static readonly ILog Logger = LogProvider.For<OctopusClient>();
 
@@ -53,7 +53,14 @@ internal OctopusClient(OctopusServerEndpoint serverEndpoint, string requestingTo
             Repository = new OctopusRepository(this);
         }
 
-        public RootResource RootDocument => Repository.LoadRootDocument();
+        public RootResource RootDocument => (this as IOctopusServerRootResourceCache)?.CachedRootResource ?? Repository.LoadRootDocument();
+
+        RootResource IOctopusServerRootResourceCache.CachedRootResource
+        {
+            get => serverEndpoint.CachedRootResource;
+            set => serverEndpoint.CachedRootResource = value;
+        }
+
         public IOctopusRepository Repository { get; private set; }
 
         /// <summary>
@@ -61,6 +68,8 @@ internal OctopusClient(OctopusServerEndpoint serverEndpoint, string requestingTo
         /// </summary>
         public bool IsUsingSecureConnection => serverEndpoint.IsUsingSecureConnection;
 
+        public IOctopusClient AsUser(string apiKey, OctopusClientOptions options = null) => new OctopusClient(serverEndpoint.AsUser(apiKey), options);
+
         public IOctopusSpaceRepository ForSpace(SpaceResource space)
         {
             ValidateSpaceId(space);
diff --git a/source/Octopus.Server.Client/OctopusRepository.cs b/source/Octopus.Server.Client/OctopusRepository.cs
index 6d011de1..5961536f 100644
--- a/source/Octopus.Server.Client/OctopusRepository.cs
+++ b/source/Octopus.Server.Client/OctopusRepository.cs
@@ -217,6 +217,11 @@ public string Link(string name)
 
         RootResource LoadRootDocumentInner()
         {
+            if (Client is IOctopusServerRootResourceCache { CachedRootResource: { } rootResource })
+            {
+                return rootResource;
+            }
+
             var watch = Stopwatch.StartNew();
             Exception lastError = null;
 
@@ -270,6 +275,11 @@ RootResource LoadRootDocumentInner()
             if (current < min || current > max)
                 throw new UnsupportedApiVersionException(string.Format("This Octopus Deploy server uses a newer API specification ({0}) than this tool can handle ({1} to {2}). Please check for updates to this tool.", rootDocument.ApiVersion, ApiConstants.SupportedApiSchemaVersionMin, ApiConstants.SupportedApiSchemaVersionMax));
 
+            if (Client is IOctopusServerRootResourceCache cache)
+            {
+                cache.CachedRootResource = rootDocument;
+            }
+
             return rootDocument;
         }
 
diff --git a/source/Octopus.Server.Client/OctopusServerEndpoint.cs b/source/Octopus.Server.Client/OctopusServerEndpoint.cs
index 52aba366..27960559 100644
--- a/source/Octopus.Server.Client/OctopusServerEndpoint.cs
+++ b/source/Octopus.Server.Client/OctopusServerEndpoint.cs
@@ -1,12 +1,13 @@
 using System;
 using System.Net;
+using Octopus.Client.Model;
 
 namespace Octopus.Client
 {
     /// <summary>
     /// Specifies the location and credentials to use when communicating with an Octopus Deploy server.
     /// </summary>
-    public class OctopusServerEndpoint
+    public class OctopusServerEndpoint : IOctopusServerRootResourceCache
     {
         /// <summary>
         /// Create an instance with a Token to authenticate.
@@ -148,7 +149,11 @@ public OctopusServerEndpoint(ILinkResolver octopusServer, string apiKey, ICreden
         /// <returns>An endpoint with a new user.</returns>
         public OctopusServerEndpoint AsUser(string newUserApiKey)
         {
-            return new OctopusServerEndpoint(OctopusServer, newUserApiKey, Credentials);
+            return new OctopusServerEndpoint(OctopusServer, newUserApiKey, Credentials)
+            {
+                // Preserve the cached root resource as we're still working with the same server, just a different API key
+                CachedRootResource = CachedRootResource,
+            };
         }
 
         /// <summary>
@@ -156,6 +161,8 @@ public OctopusServerEndpoint AsUser(string newUserApiKey)
         /// </summary>
         public IWebProxy Proxy { get; set; }
 
+        public RootResource CachedRootResource { get; set; } = null;
+
         private static DefaultLinkResolver GetLinkResolverFromServerUrl(string octopusServerAddress)
         {
             if (string.IsNullOrWhiteSpace(octopusServerAddress))