Reduce bandwidth for high-latency connections

- JPEG quality 30 -> 20
- Server tick rate 35fps -> 20fps
- Mouse flush rate 60Hz -> 20Hz (matched to tick rate)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ilya-zakirzyanov

client/doom-client.js

@@ -169,14 +169,14 @@ export default class DoomClient {
       }
     });
 
-    // Flush mouse deltas at 60Hz
+    // Flush mouse deltas at 20Hz (matched to server tick rate)
     this._mouseFlushInterval = setInterval(() => {
       if (this._mouseDx !== 0 || this._mouseDy !== 0) {
         this._send({ type: 'mouse', dx: this._mouseDx, dy: this._mouseDy });
         this._mouseDx = 0;
         this._mouseDy = 0;
       }
-    }, 1000 / 60);
+    }, 1000 / 20);
 
     // Notify app.js of pointer lock changes
     document.addEventListener('pointerlockchange', () => {

game_manager.py

@@ -419,7 +419,7 @@ def _compress_frame(self, screen: np.ndarray) -> bytes:
         """Compress RGB screen buffer to JPEG bytes."""
         img = Image.fromarray(screen)
         buf = io.BytesIO()
-        img.save(buf, format="JPEG", quality=30)
+        img.save(buf, format="JPEG", quality=20)
         return buf.getvalue()
 
     def _extract_audio(self, state) -> bytes | None:

server.py

@@ -14,7 +14,7 @@
 PORT = 3000 if IS_PRODUCTION else int(os.environ.get("PORT", "3000"))
 DIST_DIR = os.path.join(os.path.dirname(__file__), "dist")
 
-TICK_RATE = 1 / 35  # 35 fps (original Doom tic rate)
+TICK_RATE = 1 / 20  # 20 fps (reduced for lower bandwidth over high-latency connections)
 
 # Binary message tags (first byte)
 TAG_VIDEO = b"\x01"