diff --git a/picireny/cli.py b/picireny/cli.py
index de17937..2275a64 100644
--- a/picireny/cli.py
+++ b/picireny/cli.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2016-2022 Renata Hodovan, Akos Kiss.
+# Copyright (c) 2016-2023 Renata Hodovan, Akos Kiss.
 #
 # Licensed under the BSD 3-Clause License
 # <LICENSE.rst or https://opensource.org/licenses/BSD-3-Clause>.
@@ -120,11 +120,12 @@ def process_args(args):
 
 
 def log_tree(title, hdd_tree):
-    logger.debug('%s\n\theight: %s\n\tshape: %s\n\tnodes: %s\n',
-                 title,
-                 info.height(hdd_tree),
-                 ', '.join(str(cnt) for cnt in info.shape(hdd_tree)),
-                 ', '.join(f'{cnt} {ty}' for ty, cnt in sorted(info.count(hdd_tree).items())))
+    if logger.isEnabledFor(logging.DEBUG):
+        logger.debug('%s\n\theight: %s\n\tshape: %s\n\tnodes: %s\n',
+                     title,
+                     info.height(hdd_tree),
+                     ', '.join(str(cnt) for cnt in info.shape(hdd_tree)),
+                     ', '.join(f'{cnt} {ty}' for ty, cnt in sorted(info.count(hdd_tree).items())))
     logger.trace('%r', hdd_tree)
 
 
diff --git a/picireny/hdd.py b/picireny/hdd.py
index febe42e..459dc8e 100644
--- a/picireny/hdd.py
+++ b/picireny/hdd.py
@@ -1,5 +1,5 @@
 # Copyright (c) 2007 Ghassan Misherghi.
-# Copyright (c) 2016-2022 Renata Hodovan, Akos Kiss.
+# Copyright (c) 2016-2023 Renata Hodovan, Akos Kiss.
 # Copyright (c) 2021 Daniel Vince
 #
 # Licensed under the BSD 3-Clause License
@@ -73,7 +73,8 @@ def _collect_level_nodes(node, current_level):
                 if not level_nodes:
                     continue
 
-            logger.info('Checking level %d / %d ...', level, height(hdd_tree))
+            if logger.isEnabledFor(logging.INFO):
+                logger.info('Checking level %d / %d ...', level, height(hdd_tree))
 
             for trans_cnt, transformation in enumerate(transformations):
                 hdd_tree, transformed = transformation(hdd_tree, level_nodes,
diff --git a/picireny/hoist.py b/picireny/hoist.py
index 4d9f494..bb699d9 100644
--- a/picireny/hoist.py
+++ b/picireny/hoist.py
@@ -80,7 +80,8 @@ def _collect_hoistables(desc):
         for run in itertools.count():
             logger.info('Run #%d', run)
             logger.info('\tMapping size: %d', len(mapping))
-            logger.debug('\tMapping: %r', {c.id: m.id for c, m in mapping.items()})
+            if logger.isEnabledFor(logging.DEBUG):
+                logger.debug('\tMapping: %r', {c.id: m.id for c, m in mapping.items()})
 
             for i, (c, m) in enumerate((c, m) for c in config for m in collect_hoistables(mapping.get(c, c))):
                 new_mapping = mapping.copy()