diff --git a/CHANGES.rst b/CHANGES.rst
index 7a6fe678..13282dee 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -113,12 +113,12 @@ Changes in this release include the following:
 
 * Fix rendering and mouse sensitivity in UltimateListCtrl when adding HyperText
   items. (#1010)
-  
+
 * Added a parameter to lib.agw.CustomTreeCtrl.SetItemWindow(), to allow
   positioning the Window (a small image) on the left of text in a
   CustomTreeItem. (#PR886).
 
-* Declared DeleteAllPages in the notebook subclasses, so the proper C++ 
+* Declared DeleteAllPages in the notebook subclasses, so the proper C++
   implementation will be called. (#972)
 
 * Removed wx.lib.floatbar, which has been deprecated forever and probably
@@ -135,7 +135,7 @@ Changes in this release include the following:
 
 * Fixed wx.ListCtrl.Append when wx.LC_SORT style is used, so appending items out
   of order does not lose the data for the remaining columns. (#906)
-  
+
 * Add wx.Accessible, it's Windows-only, will raise a NotImplementedError
   exception on the other platforms. (#958)
 
@@ -152,8 +152,8 @@ Changes in this release include the following:
   way. If you need to use some other encoding for some reason you can first
   convert the text to a bytesarray or other buffer protocol compatible object and
   then create the virtual file from that data. (#969)
-  
 
+* Performance update for `wx.lib.agw.customtreectrl` (#1049)
 
 
 
diff --git a/wx/lib/agw/customtreectrl.py b/wx/lib/agw/customtreectrl.py
index 4ab4e01a..d5b8cd3b 100644
--- a/wx/lib/agw/customtreectrl.py
+++ b/wx/lib/agw/customtreectrl.py
@@ -3504,7 +3504,7 @@ class CustomTreeCtrl(wx.ScrolledWindow):
         :see: The :meth:`~CustomTreeCtrl.__init__` method for the `flag` parameter description.
         """
 
-        return self._agwStyle & flag
+        return bool(self._agwStyle & flag)
 
 
     def SetAGWWindowStyleFlag(self, agwStyle):
diff --git a/wx/lib/agw/hypertreelist.py b/wx/lib/agw/hypertreelist.py
index 2c3bd0b2..ce008d11 100644
--- a/wx/lib/agw/hypertreelist.py
+++ b/wx/lib/agw/hypertreelist.py
@@ -3104,7 +3104,7 @@ class TreeListMainWindow(CustomTreeCtrl):
         # horizontal lines between rows?
         draw_row_lines = self.HasAGWFlag(TR_ROW_LINES)
 
-        if self.IsExposed(exposed_x, exposed_y, _MAX_WIDTH, h + draw_row_lines):
+        if self.IsExposed(exposed_x, exposed_y, _MAX_WIDTH, h + int(draw_row_lines)):
             if draw_row_lines:
                 total_width = self._owner.GetHeaderWindow().GetWidth()
                 # if the background colour is white, choose a
@@ -4365,7 +4365,7 @@ class HyperTreeList(wx.Control):
         """
 
         agwStyle = self.GetAGWWindowStyleFlag()
-        res = (agwStyle & flag and [True] or [False])[0]
+        res = bool(agwStyle & flag)
         return res