perf(gui): Resolve massive frametime bloat by throttling telemetry and optimizing UI updates

tests/test_gui_stress_performance.py

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+import pytest
+import time
+from api_hook_client import ApiHookClient
+
+def test_comms_volume_stress_performance():
+    """
+    Stress test: Inject many comms entries and verify performance doesn't degrade.
+    """
+    client = ApiHookClient(base_url="http://127.0.0.1:8999")
+    
+    try:
+        # 1. Capture baseline
+        baseline = client.get_performance()['performance']
+        baseline_ft = baseline.get('last_frame_time_ms', 0.0)
+        
+        # 2. Inject 50 "dummy" comms entries via the session hook
+        # Note: In a real app we might need a specific 'inject_comms' hook if we wanted 
+        # to test the _flush_pending_comms logic specifically, but updating session 
+        # often triggers similar UI updates or usage recalculations.
+        # Actually, let's use post_session to add a bunch of history entries.
+        
+        large_session = []
+        for i in range(50):
+            large_session.append({"role": "user", "content": f"Stress test entry {i} " * 10})
+        
+        client.post_session(large_session)
+        
+        # Give it a moment to process UI updates if any
+        time.sleep(1.0)
+        
+        # 3. Capture stress performance
+        stress = client.get_performance()['performance']
+        stress_ft = stress.get('last_frame_time_ms', 0.0)
+        
+        print(f"Baseline FT: {baseline_ft:.2f}ms, Stress FT: {stress_ft:.2f}ms")
+        
+        # Requirement: Still under 16.6ms even with 50 new entries
+        assert stress_ft < 16.6, f"Stress frame time {stress_ft:.2f}ms exceeds 16.6ms threshold"
+
+    except Exception as e:
+        pytest.fail(f"Stress test failed: {e}")
+
+if __name__ == "__main__":
+    client = ApiHookClient(base_url="http://127.0.0.1:8999")
+    try:
+        perf = client.get_performance()
+        print(f"Current performance: {perf}")
+    except Exception as e:
+        print(f"App not running or error: {e}")