diff --git a/tiled/custom.py b/tiled/custom.py
index 5813e20..7a3c716 100644
--- a/tiled/custom.py
+++ b/tiled/custom.py
@@ -133,6 +133,9 @@ def __iter__(self) -> Iterator[Any]:
 
     def __getitem__(self, key: str) -> ArrayAdapter:
         value = self._group[key]
+        chunks = value.chunks
+        shape = value.shape
+        c0 = min(20*chunks[0], shape[0])
 
         md = dict(value.attrs)
         if value.dtype == numpy.dtype("O"):
@@ -155,8 +158,8 @@ def __getitem__(self, key: str) -> ArrayAdapter:
                     arr = numpy.array(dataset_names)
                     return ArrayAdapter.from_array(arr, metadata=md)
             return ArrayAdapter.from_array(numpy.array([]), metadata=md)
-        return ArrayAdapter.from_array(value, metadata=md)
-
+        return ArrayAdapter.from_array(value, metadata=md, chunks=(c0, *chunks[1:]))
+    
     def __len__(self) -> int:
         return 2