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Add caching for DataTable._get_row_renderables() #5959

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Merged
willmcgugan merged 1 commit into from
Jul 25, 2025
Merged

Add caching for DataTable._get_row_renderables() #5959

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17 changes: 17 additions & 0 deletions src/textual/widgets/_data_table.py
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Original file line number Diff line number Diff line change
Expand Up @@ -749,6 +749,10 @@ def __init__(
we need to re-render it. """
self._cell_render_cache: LRUCache[CellCacheKey, SegmentLines] = LRUCache(10000)
"""Cache for individual cells."""
self._row_renderable_cache: LRUCache[tuple[int, int], RowRenderables] = (
LRUCache(1000)
)
"""Caches row renderables - key is (update_count, row_index)"""
self._line_cache: LRUCache[LineCacheKey, Strip] = LRUCache(1000)
"""Cache for lines within rows."""
self._offset_cache: LRUCache[int, list[tuple[RowKey, int]]] = LRUCache(1)
Expand Down Expand Up @@ -1086,6 +1090,7 @@ def get_column_index(self, column_key: ColumnKey | str) -> int:
def _clear_caches(self) -> None:
self._row_render_cache.clear()
self._cell_render_cache.clear()
self._row_renderable_cache.clear()
self._line_cache.clear()
self._styles_cache.clear()
self._offset_cache.clear()
Expand All @@ -1109,6 +1114,7 @@ def notify_style_update(self) -> None:
super().notify_style_update()
self._row_render_cache.clear()
self._cell_render_cache.clear()
self._row_renderable_cache.clear()
self._line_cache.clear()
self._styles_cache.clear()
self._get_styles_to_render_cell.cache_clear()
Expand Down Expand Up @@ -1990,6 +1996,17 @@ def _get_row_renderables(self, row_index: int) -> RowRenderables:
Returns:
A RowRenderables containing the optional label and the rendered cells.
"""
update_count = self._update_count
cache_key = (update_count, row_index)
if cache_key in self._row_renderable_cache:
row_renderables = self._row_renderable_cache[cache_key]
else:
row_renderables = self._compute_row_renderables(row_index)
self._row_renderable_cache[cache_key] = row_renderables
return row_renderables

def _compute_row_renderables(self, row_index: int) -> RowRenderables:
"""Actual computation for _get_row_renderables"""
ordered_columns = self.ordered_columns
if row_index == -1:
header_row: list[RenderableType] = [
Expand Down
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