diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 337dbf334..48a30949a 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -524,8 +524,6 @@ def checkDynamicContent(firstPage, secondPage):
         infoMsg = "dynamic content marked for removal (%d region%s)" % (len(kb.dynamicMarkings), 's' if len(kb.dynamicMarkings) > 1 else '')
         logger.info(infoMsg)
 
-        kb.pageTemplate = removeDynamicContent(kb.pageTemplate)
-
 def checkStability():
     """
     This function checks if the URL content is stable requesting the
diff --git a/lib/core/common.py b/lib/core/common.py
index 402c1ec5b..c78134121 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -1642,10 +1642,10 @@ def removeDynamicContent(page):
         for item in kb.dynamicMarkings:
             prefix, suffix = item
             if prefix is None:
-                page = re.sub('(?s)^.+%s' % suffix, suffix, page)
+                getCompiledRegex('(?s)^.+%s' % suffix).sub(suffix, page)
             elif suffix is None:
-                page = re.sub('(?s)%s.+$' % prefix, prefix, page)
+                getCompiledRegex('(?s)%s.+$' % prefix).sub(prefix, page)
             else:
-                page = re.sub('(?s)%s.+%s' % (prefix, suffix), '%s%s' % (prefix, suffix), page)
+                getCompiledRegex('(?s)%s.+%s' % (prefix, suffix)).sub('%s%s' % (prefix, suffix), page)
 
     return page
diff --git a/lib/request/comparison.py b/lib/request/comparison.py
index 4192349e2..4ea8ac703 100644
--- a/lib/request/comparison.py
+++ b/lib/request/comparison.py
@@ -62,6 +62,7 @@ def comparison(page, headers=None, getSeqMatcher=False, pageLength=None):
         # Dynamic content lines to be excluded before comparison
         if not kb.nullConnection and not conf.longestCommon:
             page = removeDynamicContent(page)
+            conf.seqMatcher.set_seq1(removeDynamicContent(kb.pageTemplate))
 
         if not pageLength:
             pageLength = len(page)