diff --git a/extension/tests/port_login_flow_test.cpp b/extension/tests/port_login_flow_test.cpp
index 7826d806..d3cdc430 100644
--- a/extension/tests/port_login_flow_test.cpp
+++ b/extension/tests/port_login_flow_test.cpp
@@ -162,6 +162,17 @@ static bool pump_until(double seconds, const std::function<bool()>& done)
 	return done();
 }
 
+// Runs a fixed number of frames: the wait between a mouse move and its click must not depend on how
+// many frames a loaded machine fits into a wall-clock slice (ctest -j).
+static void pump_frames(int count)
+{
+	for (int i = 0; i < count && PythonBoot::IsAppLooping(); ++i)
+	{
+		PythonBoot::UIUpdate();
+		std::this_thread::sleep_for(std::chrono::milliseconds(16));
+	}
+}
+
 static void dump(FakeLoginServer& server)
 {
 	std::fprintf(stderr, "server events:");
@@ -617,7 +628,7 @@ int main(int argc, char** argv)
 		// Holding ALT (game.GameWindow.ShowName) makes OnRender show every tail in range and project it after
 		// app.RenderGame; the item tail keeps that screen rect, which is what textTail.Pick tests.
 		PythonBoot::UIKey(DIK_LMENU, true);
-		pump_until(0.1, [] { return false; });
+		pump_frames(6);
 		PythonBoot::UIKey(DIK_LMENU, false);
 		int picked = -1, pick_x = 0, pick_y = 0;
 		for (int y = 0; y < 1200 && picked < 0; y += 2)
@@ -677,7 +688,7 @@ int main(int argc, char** argv)
 		if (main_instance)
 			main_instance->NEW_GetPixelPosition(&start);
 		PythonBoot::UIMouseButton(1, true, 400, 220);
-		pump_until(0.1, [] { return false; });
+		pump_frames(6);
 		PythonBoot::UIMouseButton(1, false, 400, 220);
 		CHECK(main_instance && pump_until(3, [&] { return walked() > 100.0f; }));
 		CHECK(main_instance && pump_until(10, [&] { return !main_instance->IsWalking(); }));
@@ -728,7 +739,7 @@ int main(int argc, char** argv)
 			auto [sx, sy] = dog_on_screen();
 			std::printf("port_login_flow_test: stray dog on screen at %d %d\n", sx, sy);
 			PythonBoot::UIMouseMove(sx, sy);
-			pump_until(0.1, [] { return false; });
+			pump_frames(6);
 			// game.GameWindow.OnMouseLeftButtonDown → player.SetMouseState(MBT_LEFT, MBS_PRESS): MBF_SMART on an
 			// actor is __OnPressActor, which walks into range (__ReserveClickActor) and attacks while the button is
 			// held; the cursor follows the dog as the camera follows the actor, as a player's hand would.
@@ -761,14 +772,14 @@ int main(int argc, char** argv)
 
 					// Zoom IN: positive wheel delta
 					PythonBoot::UIMouseWheel(120);
-					pump_until(0.1, [] { return false; });
+					pump_frames(6);
 					const float zoomed_in_dist = pkCmrCur->GetDistance();
 					std::printf("port_login_flow_test: zoomed in camera distance = %f\n", zoomed_in_dist);
 					CHECK(zoomed_in_dist < initial_dist);
 
 					// Zoom OUT: negative wheel delta
 					PythonBoot::UIMouseWheel(-240);
-					pump_until(0.1, [] { return false; });
+					pump_frames(6);
 					const float zoomed_out_dist = pkCmrCur->GetDistance();
 					std::printf("port_login_flow_test: zoomed out camera distance = %f\n", zoomed_out_dist);
 					CHECK(zoomed_out_dist > zoomed_in_dist);
@@ -796,7 +807,7 @@ int main(int argc, char** argv)
 					bool has_effects = false;
 					for (int step = 0; step < 10; ++step)
 					{
-						pump_until(0.1, [] { return false; });
+						pump_frames(6);
 						if (CEffectInstance::GetRenderingEffectCount() > 0)
 							has_effects = true;
 					}
@@ -833,9 +844,9 @@ int main(int argc, char** argv)
 			auto [kx, ky] = keeper_on_screen();
 			std::printf("port_login_flow_test: shopkeeper on screen at %d %d\n", kx, ky);
 			PythonBoot::UIMouseMove(kx, ky);
-			pump_until(0.1, [] { return false; });
+			pump_frames(6);
 			PythonBoot::UIMouseButton(1, true, kx, ky);
-			pump_until(0.1, [] { return false; });
+			pump_frames(6);
 			PythonBoot::UIMouseButton(1, false, kx, ky);
 			CHECK(pump_until(5, [&] { return server->Has("game2:click " + std::to_string(FakeLoginServer::kShopVID)); }));
 			CHECK(pump_until(2, [] { return py_true("__import__('shop').IsOpen() and _stream.curPhaseWindow.interface.dlgShop.IsShow()"); }));
@@ -1009,9 +1020,9 @@ int main(int argc, char** argv)
 			auto [sx, sy] = storekeeper_on_screen();
 			std::printf("port_login_flow_test: storekeeper on screen at %d %d\n", sx, sy);
 			PythonBoot::UIMouseMove(sx, sy);
-			pump_until(0.1, [] { return false; });
+			pump_frames(6);
 			PythonBoot::UIMouseButton(1, true, sx, sy);
-			pump_until(0.1, [] { return false; });
+			pump_frames(6);
 			PythonBoot::UIMouseButton(1, false, sx, sy);
 			CHECK(pump_until(5, [&] { return server->Has("game2:click " + std::to_string(FakeLoginServer::kSafeboxVID)); }));
 			CHECK(pump_until(2, [] {