diff --git a/piker/ui/_cursor.py b/piker/ui/_cursor.py
index 8a74ffc7..7415005a 100644
--- a/piker/ui/_cursor.py
+++ b/piker/ui/_cursor.py
@@ -42,7 +42,7 @@ log = get_logger(__name__)
 # latency (in terms of perceived lag in cross hair) so really be sure
 # there's an improvement if you want to change it!
 _mouse_rate_limit = 60  # TODO; should we calc current screen refresh rate?
-_debounce_delay = 1 / 2e3
+_debounce_delay = 1 / 1e3
 _ch_label_opac = 1
 
 
@@ -52,12 +52,15 @@ class LineDot(pg.CurvePoint):
 
     def __init__(
         self,
+
         curve: pg.PlotCurveItem,
         index: int,
+
         plot: 'ChartPlotWidget',  # type: ingore # noqa
         pos=None,
         size: int = 6,  # in pxs
         color: str = 'default_light',
+
     ) -> None:
         pg.CurvePoint.__init__(
             self,
@@ -88,7 +91,9 @@ class LineDot(pg.CurvePoint):
 
     def event(
         self,
+
         ev: QtCore.QEvent,
+
     ) -> None:
         if not isinstance(
             ev, QtCore.QDynamicPropertyChangeEvent
@@ -132,8 +137,8 @@ class ContentsLabel(pg.LabelItem):
     }
 
     def __init__(
-
         self,
+
         # chart: 'ChartPlotWidget',  # noqa
         view: pg.ViewBox,
 
@@ -167,8 +172,8 @@ class ContentsLabel(pg.LabelItem):
         self.anchor(itemPos=index, parentPos=index, offset=margins)
 
     def update_from_ohlc(
-
         self,
+
         name: str,
         index: int,
         array: np.ndarray,
@@ -194,8 +199,8 @@ class ContentsLabel(pg.LabelItem):
         )
 
     def update_from_value(
-
         self,
+
         name: str,
         index: int,
         array: np.ndarray,
@@ -239,6 +244,7 @@ class ContentsLabels:
 
             if not (index >= 0 and index < chart._arrays['ohlc'][-1]['index']):
                 # out of range
+                print('out of range?')
                 continue
 
             array = chart._arrays[name]
@@ -278,7 +284,9 @@ class ContentsLabels:
 
 
 class Cursor(pg.GraphicsObject):
+    '''Multi-plot cursor for use on a ``LinkedSplits`` chart (set).
 
+    '''
     def __init__(
 
         self,