diff --git a/RFG_ADC_dataplotter.py b/RFG_ADC_dataplotter.py
index 024fca9..3a6049d 100755
--- a/RFG_ADC_dataplotter.py
+++ b/RFG_ADC_dataplotter.py
@@ -264,9 +264,25 @@ def main():
         default=None,
         help="Фиксированные Y-пределы для кривой формата min,max (например -1000,1000). По умолчанию авто",
     )
+    parser.add_argument(
+        "--backend",
+        choices=["auto", "pg", "mpl"],
+        default="auto",
+        help="Графический бэкенд: pyqtgraph (pg) — быстрее; matplotlib (mpl) — совместимый. По умолчанию auto",
+    )
 
     args = parser.parse_args()
 
+    # Попробуем быстрый бэкенд (pyqtgraph) при auto/pg
+    if args.backend in ("auto", "pg"):
+        try:
+            return run_pyqtgraph(args)
+        except Exception as e:
+            if args.backend == "pg":
+                sys.stderr.write(f"[error] PyQtGraph бэкенд недоступен: {e}\n")
+                sys.exit(1)
+            # При auto — тихо откатываемся на matplotlib
+
     try:
         import matplotlib
         import matplotlib.pyplot as plt
@@ -288,6 +304,7 @@ def main():
 
     # Состояние для отображения
     current_sweep: Optional[np.ndarray] = None
+    x_shared: Optional[np.ndarray] = None
     width: Optional[int] = None
     max_sweeps = int(max(10, args.max_sweeps))
     ring = None  # type: Optional[np.ndarray]
@@ -327,10 +344,11 @@ def main():
     frames_since_ylim_update = 0
 
     def ensure_buffer(w: int):
-        nonlocal ring, width, head
+        nonlocal ring, width, head, x_shared
         if ring is not None and width == w:
             return
         width = w
+        x_shared = np.arange(w, dtype=np.int32)
         ring = np.full((max_sweeps, w), np.nan, dtype=np.float32)
         head = 0
         # Обновляем изображение под новые размеры
@@ -386,8 +404,8 @@ def main():
 
         # Обновление линии последнего свипа
         if current_sweep is not None:
-            x = np.arange(current_sweep.size, dtype=np.int32)
-            line_obj.set_data(x, current_sweep)
+            xs = x_shared if x_shared is not None and x_shared.size == current_sweep.size else np.arange(current_sweep.size, dtype=np.int32)
+            line_obj.set_data(xs, current_sweep)
             # Лимиты по X постоянные под текущую ширину
             ax_line.set_xlim(0, max(1, current_sweep.size - 1))
             # Y-лимиты: фиксированные либо периодическая автоподстройка
@@ -421,5 +439,156 @@ def main():
     reader.join(timeout=1.0)
 
 
+def run_pyqtgraph(args):
+    """Быстрый GUI на PyQtGraph. Требует pyqtgraph и PyQt5/PySide6."""
+    try:
+        import pyqtgraph as pg
+        from PyQt5 import QtCore, QtWidgets  # noqa: F401
+    except Exception:
+        # Возможно установлена PySide6
+        try:
+            import pyqtgraph as pg
+            from PySide6 import QtCore, QtWidgets  # noqa: F401
+        except Exception as e:
+            raise RuntimeError(
+                "pyqtgraph/PyQt5(Pyside6) не найдены. Установите: pip install pyqtgraph PyQt5"
+            ) from e
+
+    # Очередь завершённых свипов и поток чтения
+    q: Queue[np.ndarray] = Queue(maxsize=1000)
+    stop_event = threading.Event()
+    reader = SweepReader(args.port, args.baud, q, stop_event)
+    reader.start()
+
+    # Настройки скорости
+    max_sweeps = int(max(10, args.max_sweeps))
+    max_fps = max(1.0, float(args.max_fps))
+    interval_ms = int(1000.0 / max_fps)
+
+    # PyQtGraph настройки
+    pg.setConfigOptions(useOpenGL=True, antialias=False)
+    app = pg.mkQApp(args.title)
+    win = pg.GraphicsLayoutWidget(show=True, title=args.title)
+    win.resize(1200, 600)
+
+    # Плот последнего свипа (слева)
+    p_line = win.addPlot(row=0, col=0, title="Последний свип")
+    p_line.showGrid(x=True, y=True, alpha=0.3)
+    curve = p_line.plot(pen=pg.mkPen((80, 120, 255), width=1))
+    p_line.setLabel("bottom", "X")
+    p_line.setLabel("left", "Y")
+
+    # Водопад (справа)
+    p_img = win.addPlot(row=0, col=1, title="Водопад (последние свипы)")
+    p_img.invertY(True)  # 0 сверху, новые снизу
+    p_img.showGrid(x=False, y=False)
+    p_img.setLabel("bottom", "X")
+    p_img.setLabel("left", "Номер свипа (время →)")
+    img = pg.ImageItem()
+    p_img.addItem(img)
+
+    # Состояние
+    ring: Optional[np.ndarray] = None
+    head = 0
+    width: Optional[int] = None
+    x_shared: Optional[np.ndarray] = None
+    current_sweep: Optional[np.ndarray] = None
+    y_min, y_max = None, None
+    fixed_ylim: Optional[Tuple[float, float]] = None
+    if args.ylim:
+        try:
+            y0, y1 = args.ylim.split(",")
+            fixed_ylim = (float(y0), float(y1))
+            p_line.setYRange(fixed_ylim[0], fixed_ylim[1], padding=0)
+        except Exception:
+            pass
+
+    def ensure_buffer(w: int):
+        nonlocal ring, head, width, x_shared
+        if ring is not None and width == w:
+            return
+        width = w
+        x_shared = np.arange(w, dtype=np.int32)
+        ring = np.full((max_sweeps, w), np.nan, dtype=np.float32)
+        head = 0
+        img.setImage(ring, autoLevels=False)
+        p_img.setRange(xRange=(0, max(1, w - 1)), yRange=(0, max_sweeps - 1), padding=0)
+        p_line.setXRange(0, max(1, w - 1), padding=0)
+
+    def push_sweep(s: np.ndarray):
+        nonlocal ring, head, y_min, y_max
+        if s is None or s.size == 0 or ring is None:
+            return
+        w = ring.shape[1]
+        row = np.full((w,), np.nan, dtype=np.float32)
+        take = min(w, s.size)
+        row[:take] = s[:take]
+        ring[head, :] = row
+        head = (head + 1) % ring.shape[0]
+        # Обновление экстремумов
+        sv_min = np.nanmin(row)
+        sv_max = np.nanmax(row)
+        if y_min is None or (not np.isnan(sv_min) and sv_min < y_min):
+            y_min = float(sv_min)
+        if y_max is None or (not np.isnan(sv_max) and sv_max > y_max):
+            y_max = float(sv_max)
+
+    def drain_queue():
+        nonlocal current_sweep
+        drained = 0
+        while True:
+            try:
+                s = q.get_nowait()
+            except Empty:
+                break
+            drained += 1
+            current_sweep = s
+            ensure_buffer(s.size)
+            push_sweep(s)
+        return drained
+
+    # Попытка применить LUT из колормэпа (если доступен)
+    try:
+        cm_mod = getattr(pg, "colormap", None)
+        if cm_mod is not None:
+            cm = cm_mod.get(args.cmap)
+            img.setLookupTable(cm.getLookupTable(0.0, 1.0, 256))
+    except Exception:
+        pass
+
+    def update():
+        changed = drain_queue() > 0
+        if current_sweep is not None and x_shared is not None:
+            curve.setData(x_shared[: current_sweep.size], current_sweep, autoDownsample=True)
+            if fixed_ylim is None:
+                y0 = float(np.nanmin(current_sweep))
+                y1 = float(np.nanmax(current_sweep))
+                if np.isfinite(y0) and np.isfinite(y1):
+                    margin = 0.05 * max(1.0, (y1 - y0))
+                    p_line.setYRange(y0 - margin, y1 + margin, padding=0)
+
+        if changed and ring is not None:
+            disp = ring if head == 0 else np.roll(ring, -head, axis=0)
+            if y_min is not None and y_max is not None and y_min != y_max and np.isfinite(y_min) and np.isfinite(y_max):
+                img.setImage(disp, autoLevels=False, levels=(y_min, y_max))
+            else:
+                img.setImage(disp, autoLevels=False)
+
+    timer = pg.QtCore.QTimer()
+    timer.timeout.connect(update)
+    timer.start(interval_ms)
+
+    def on_quit():
+        stop_event.set()
+        reader.join(timeout=1.0)
+
+    app.aboutToQuit.connect(on_quit)
+    win.show()
+    exec_fn = getattr(app, "exec_", None) or getattr(app, "exec", None)
+    exec_fn()
+    # На случай если aboutToQuit не сработал
+    on_quit()
+
+
 if __name__ == "__main__":
     main()