Minor change in dask docs from dask maintainer (#1568)

* patrick feedback on daks docs

* Update datasets-dask.md

Author: lhoestq

docs/hub/datasets-dask.md

@@ -71,6 +71,13 @@ def dummy_count_words(texts):
     return pd.Series([len(text.split(" ")) for text in texts])
 ```
 
+or a similar function using pandas string methods (faster):
+
+```python
+def dummy_count_words(texts):
+    return texts.str.count(" ")
+```
+
 In pandas you can use this function on a text column:
 
 ```python
@@ -116,3 +123,29 @@ This is useful when you want to manipulate a subset of the columns or for analyt
 # for the filtering and computation and skip the other columns.
 df.token_count.mean().compute()
 ```
+
+## Client
+
+Most features in `dask` are optimized for a cluster or a local `Client` to launch the parallel computations:
+
+```python
+import dask.dataframe as dd
+from distributed import Client
+
+if __name__ == "__main__":  # needed for creating new processes
+    client = Client()
+    df = dd.read_parquet(...)
+    ...
+```
+
+For local usage, the `Client` uses a Dask `LocalCluster` with multiprocessing by default. You can manually configure the multiprocessing of `LocalCluster` with
+
+```python
+from dask.distributed import Client, LocalCluster
+cluster = LocalCluster(n_workers=8, threads_per_worker=8)
+client = Client(cluster)
+```
+
+Note that if you use the default threaded scheduler locally without `Client`, a DataFrame can become slower after certain operations (more details [here](https://github.com/dask/dask-expr/issues/1181)).
+
+Find more information on setting up a local or cloud cluster in the [Deploying Dask documentation](https://docs.dask.org/en/latest/deploying.html).