diff --git a/site/tests/io.uce b/site/tests/io.uce
index 205ebc2..8113ddd 100644
--- a/site/tests/io.uce
+++ b/site/tests/io.uce
@@ -151,7 +151,13 @@ RENDER(Request& context)
 	check("to_u64() / to_s64() / to_f64() / to_bool()", to_u64(cfg["u64"], 7) == 42 && to_u64(cfg["bad"], 7) == 7 && to_s64(cfg["s64"], 5) == -12 && to_s64(cfg["bad"], 5) == 5 && to_f64(cfg["f64"], 1.0) > 3.49 && to_f64(cfg["bad"], 1.25) == 1.25 && to_bool(cfg["yes"], false) && !to_bool(cfg["no"], true) && !to_bool("unknown", false), var_dump(cfg));
 
 	DValue perf = request_perf();
-	check("request_perf()", perf.get_type_name() != "invalid", json_encode(perf));
+	bool perf_stable = perf["worker_pid"].to_u64() > 0 && perf["running_us"].to_f64() > 0;
+	for(u64 i = 0; i < 512 && perf_stable; i++)
+	{
+		perf = request_perf();
+		perf_stable = perf["worker_pid"].to_u64() > 0 && perf["running_us"].to_f64() > 0;
+	}
+	check("request_perf() stages stable repeated snapshots", perf_stable, json_encode(perf));
 
 	u64 parsed_epoch = time_parse("1970-01-01 00:00:05 UTC");
 	String utc_year = time_format_utc("%Y", parsed_epoch);
diff --git a/src/wasm/worker.cpp b/src/wasm/worker.cpp
index 205ce87..4142e9b 100644
--- a/src/wasm/worker.cpp
+++ b/src/wasm/worker.cpp
@@ -1711,23 +1711,29 @@ private:
 			}));
 		if(mod == "env" && name == "uce_host_request_perf")
 			return(add([self](Caller, Span<const Val> args, Span<Val> results) -> Result<std::monostate, Trap> {
-				DValue response;
-				if(self->request_perf.active)
+				String encoded;
+				if(!self->hostcall_staged("request_perf", encoded))
 				{
-					f64 now = time_precise();
-					response["worker_pid"] = (f64)self->request_perf.worker_pid;
-					response["parent_pid"] = (f64)self->request_perf.parent_pid;
-					response["request_count"] = (f64)self->request_perf.request_count;
-					if(self->request_perf.time_start > 0 && self->request_perf.time_init > 0)
-						response["accept_us"] = (f64)((self->request_perf.time_start - self->request_perf.time_init) * 1000000.0);
-					if(self->request_perf.time_start > 0)
-						response["running_us"] = (f64)((now - self->request_perf.time_start) * 1000000.0);
-					if(self->request_perf.time_init > 0)
-						response["total_us"] = (f64)((now - self->request_perf.time_init) * 1000000.0);
-					if(self->workspace_birth_us > 0)
-						response["workspace_birth_us"] = (f64)self->workspace_birth_us;
+					DValue response;
+					if(self->request_perf.active)
+					{
+						f64 now = time_precise();
+						response["worker_pid"] = (f64)self->request_perf.worker_pid;
+						response["parent_pid"] = (f64)self->request_perf.parent_pid;
+						response["request_count"] = (f64)self->request_perf.request_count;
+						if(self->request_perf.time_start > 0 && self->request_perf.time_init > 0)
+							response["accept_us"] = (f64)((self->request_perf.time_start - self->request_perf.time_init) * 1000000.0);
+						if(self->request_perf.time_start > 0)
+							response["running_us"] = (f64)((now - self->request_perf.time_start) * 1000000.0);
+						if(self->request_perf.time_init > 0)
+							response["total_us"] = (f64)((now - self->request_perf.time_init) * 1000000.0);
+						if(self->workspace_birth_us > 0)
+							response["workspace_birth_us"] = (f64)self->workspace_birth_us;
+					}
+					encoded = ucb_encode(response);
+					if(args[2].i32() == 0)
+						self->hostcall_stage("request_perf", encoded);
 				}
-				String encoded = ucb_encode(response);
 				u32 cap = (u32)args[3].i32();
 				int32_t buf = args[2].i32();
 				if(buf != 0 && cap >= encoded.size())