diff --git a/wapitiCore/net/crawler.py b/wapitiCore/net/crawler.py
index 884aec545..1e0151155 100644
--- a/wapitiCore/net/crawler.py
+++ b/wapitiCore/net/crawler.py
@@ -592,9 +592,7 @@ def __init__(self, crawler_instance: AsyncCrawler, stop_event: asyncio.Event, pa
         # Event to stop processing tasks
         self._stopped = stop_event
 
-        # CPU count + 4 is default concurrent tasks for CPython ThreadPoolExecutor with a high limit set at 32
-        self._max_tasks = min(parallelism, 32, (cpu_count() or 1) + 4)
-        self._max_tasks += round(self._max_tasks / 2)
+        self._max_tasks = min(parallelism, 32)
 
     @property
     def max_depth(self) -> int:
@@ -824,7 +822,7 @@ async def async_analyze(self, request) -> Tuple[bool, List]:
             # Sur les ressources statiques le content-length est généralement indiqué
             if self._max_page_size > 0:
                 if page.raw_size > self._max_page_size:
-                    page.clean()
+                    await page.clean()
                     return False, []
 
             await asyncio.sleep(0)
diff --git a/wapitiCore/net/page.py b/wapitiCore/net/page.py
index db83e8003..1865249bf 100644
--- a/wapitiCore/net/page.py
+++ b/wapitiCore/net/page.py
@@ -294,11 +294,11 @@ def soup(self):
                 self._soup = BeautifulSoup('', parser_name)
         return self._soup
 
-    def clean(self):
+    async def clean(self):
         if self._soup is not None:
             self._soup.decompose()
             del self._soup
-        self._response.close()
+        await self._response.aclose()
 
     @property
     @lru_cache(maxsize=2)
@@ -565,10 +565,10 @@ def is_visible(element):
     def text_only_md5(self) -> str:
         return md5(self.text_only.encode(errors="ignore")).hexdigest()
 
-    def empty(self):
+    async def empty(self):
         """Modify the current Page object to make it appears as if the content-length was 0."""
         self._is_empty = True
-        self.clean()
+        await self.clean()
 
     @property
     def encoding(self):