From b0fed12f2b12db0f4aa88d916885931c1df0a106 Mon Sep 17 00:00:00 2001
From: Janick Martinez Esturo <janick.martinez.esturo@gmail.com>
Date: Tue, 28 Nov 2023 18:27:25 +0100
Subject: [PATCH] * Cache result of FSStore._fsspec_installed

Prevent runtime-overhead in doing this check multiple times
---
 docs/release.rst | 3 +++
 zarr/storage.py  | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/docs/release.rst b/docs/release.rst
index 9873d62896..842c36e290 100644
--- a/docs/release.rst
+++ b/docs/release.rst
@@ -43,6 +43,9 @@ Docs
 Maintenance
 ~~~~~~~~~~~
 
+* Cache result of ``FSStore._fsspec_installed()``.
+  By :user:`Janick Martinez Esturo <ph03>` :issue:`1581`.
+
 * Extend copyright notice to 2023.
   By :user:`Jack Kelly <JackKelly>` :issue:`1528`.
 
diff --git a/zarr/storage.py b/zarr/storage.py
index b36f804ebd..a7426e5345 100644
--- a/zarr/storage.py
+++ b/zarr/storage.py
@@ -28,6 +28,7 @@
 import zipfile
 from collections import OrderedDict
 from collections.abc import MutableMapping
+from functools import lru_cache
 from os import scandir
 from pickle import PicklingError
 from threading import Lock, RLock
@@ -1540,6 +1541,7 @@ def clear(self):
         self.map.clear()
 
     @classmethod
+    @lru_cache(maxsize=None)
     def _fsspec_installed(cls):
         """Returns true if fsspec is installed"""
         import importlib.util