Implemented a significant performance optimization to the process of

  searching the parse tree. Patch by Morotti. [bug=1898212]

2 files changed, 13 insertions, 0 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 811171d..d6b4290 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,8 @@
+= 4.9.3 (Unreleased)
+
+* Implemented a significant performance optimization to the process of
+  searching the parse tree. Patch by Morotti. [bug=1898212]
+
 = 4.9.2 (20200926)
 
 * Fixed a bug that caused too many tags to be popped from the tag
diff --git a/bs4/element.py b/bs4/element.py
index 370b153..09a81d9 100644
--- a/bs4/element.py
+++ b/bs4/element.py
@@ -1995,6 +1995,14 @@ class SoupStrainer(object):
         if isinstance(markup_name, Tag):
             markup = markup_name
             markup_attrs = markup
+
+        if isinstance(self.name, basestring):
+            # Optimization for a very common case where the user is
+            # searching for a tag with one specific name, and we're
+            # looking at a tag with a different name.
+            if markup and not markup.prefix and self.name != markup.name:
+                 return False
+            
         call_function_with_tag_data = (
             isinstance(self.name, Callable)
             and not isinstance(markup_name, Tag))