diff --git a/perf/README.md b/perf/README.md
index 91ba69b5ab..9e6449cbe8 100644
--- a/perf/README.md
+++ b/perf/README.md
@@ -69,6 +69,7 @@ perf/ServerLoadHarness/bin/Release/net10.0/ServerLoadHarness.exe run --scenario
 | `--duration`, `--warmup` | 20, 10 | Measurement window and warm-up in seconds. |
 | `--diag`, `--audit` | 0 | Server diagnostics and auditing. |
 | `--threads`, `--queue` | 200, 2000 | `MaxRequestThreadCount` and `MaxQueuedRequestCount` of the server; `MinRequestThreadCount` is the smaller of 50 and `--threads`. |
+| `--isolation` | `default` | `sharedonly`: run the server with the SharedOnly [resource isolation](../docs/ResourceIsolation.md) mode (no isolation provider, one FIFO request queue) instead of the default profile. |
 | `--trace <file>` | | Record the measurement window with `dotnet-trace`. |
 | `--trace-profile` | `cpu` | `cpu` (sampled thread time), `alloc` (allocation ticks), `contention` or `gc`. |
 | `--trace-side` | `server` | The process to record: `server` (the child) or `client` (the harness itself). |
diff --git a/perf/ServerLoadHarness/Program.cs b/perf/ServerLoadHarness/Program.cs
index 4107c468d7..ab6c5f65b6 100644
--- a/perf/ServerLoadHarness/Program.cs
+++ b/perf/ServerLoadHarness/Program.cs
@@ -318,6 +318,10 @@ namespace Opc.Ua.Perf.ServerLoadHarness
                 : contract
                 ? new BenchmarkContractServer(telemetry, ArgInt("async-node-manager", 1) != 0)
                 : new ReferenceServer(telemetry);
+            if (Arg("isolation", "default") == "sharedonly")
+            {
+                server.ResourceIsolationOptions.Mode = Opc.Ua.Server.ServerResourceIsolationMode.SharedOnly;
+            }
             server.TransportBindings = TestTransportBindings.WithAllSchemes();
             await application.StartAsync(server).ConfigureAwait(false);
             Console.WriteLine(FormattableString.Invariant($"READY {endpointUrl} {Environment.ProcessId}"));
@@ -391,7 +395,7 @@ namespace Opc.Ua.Perf.ServerLoadHarness
                 };
             (Process startedServer, BlockingCollection<string> startedLines) = StartServerChild(
                 FormattableString.Invariant(
-                    $"server --port {port} --diag {Arg("diag", "0")} --audit {Arg("audit", "0")} --threads {Arg("threads", "200")} --counters {(scenario == "counters" ? Arg("nodes", "1") : "0")} --sampling {Arg("sampling", "10")} --queue {Arg("queue", "2000")}"),
+                    $"server --port {port} --diag {Arg("diag", "0")} --audit {Arg("audit", "0")} --threads {Arg("threads", "200")} --counters {(scenario == "counters" ? Arg("nodes", "1") : "0")} --sampling {Arg("sampling", "10")} --queue {Arg("queue", "2000")} --isolation {Arg("isolation", "default")}"),
                 serverEnvironment);
             using Process server = startedServer;
             using BlockingCollection<string> serverLines = startedLines;