1 files changed, 7 insertions, 2 deletions
diff --git a/poezio/windows/text_win.py b/poezio/windows/text_win.py
index 76c7d2d7..d0669b26 100644
--- a/poezio/windows/text_win.py
+++ b/poezio/windows/text_win.py
@@ -32,6 +32,9 @@ class Line:
 
 
 class BaseTextWin(Win):
+    __slots__ = ('lines_nb_limit', 'pos', 'built_lines', 'lock', 'lock_buffer',
+                 'separator_after')
+
     def __init__(self, lines_nb_limit: Optional[int] = None) -> None:
         if lines_nb_limit is None:
             lines_nb_limit = config.get('max_lines_in_memory')
@@ -175,6 +178,8 @@ class BaseTextWin(Win):
 
 
 class TextWin(BaseTextWin):
+    __slots__ = ('highlights', 'hl_pos', 'nb_of_highlights_after_separator')
+
     def __init__(self, lines_nb_limit: Optional[int] = None) -> None:
         BaseTextWin.__init__(self, lines_nb_limit)
 
@@ -190,8 +195,6 @@ class TextWin(BaseTextWin):
         # This is useful to make “go to next highlight“ work after a “move to separator”.
         self.nb_of_highlights_after_separator = 0
 
-        self.separator_after = None
-
     def next_highlight(self) -> None:
         """
         Go to the next highlight in the buffer.
@@ -563,6 +566,8 @@ class TextWin(BaseTextWin):
 
 
 class XMLTextWin(BaseTextWin):
+    __slots__ = ()
+
     def __init__(self) -> None:
         BaseTextWin.__init__(self)