1. tuned arrow mesh drawing

2. centralixzed arrow config in layout.py
3. seperate mesh render and display resolution to speed up (~40 fps)

examples/finger_pipeline_3dview.py

@@ -52,6 +52,17 @@ def _parse_args():
         default=5.0,
         help="Low-pass cutoff for force curves (Hz)",
     )
+    parser.add_argument(
+        "--profile",
+        action="store_true",
+        help="Print per-stage timing to the log panel / console",
+    )
+    parser.add_argument(
+        "--profile-every",
+        type=int,
+        default=30,
+        help="When --profile is set, print rolling averages every N frames",
+    )
     return parser.parse_args()