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LibWeb: Cache lowercased tag name for getElementsByTagName() iteration

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Instead of calling to_lowercase() on two strings for every step while
iterating over the HTMLCollection returned by getElementsByTagName(),
we now cache the lowercased tag name beforehand and reuse it.

2.4x speed-up on WebKit/PerformanceTests/DOM/DOMDivWalk.html
This commit is contained in:
Andreas Kling
2023-08-22 14:34:25 +02:00
parent ec340f03a5
commit 76580bb9ba
5 changed files with 8 additions and 7 deletions
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2
Userland/Libraries/LibWeb/DOM/Element.cpp
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@@ -705,7 +705,7 @@ void Element::make_html_uppercased_qualified_name()
{
// This is allowed by the spec: "User agents could optimize qualified name and HTML-uppercased qualified name by storing them in internal slots."
if (namespace_() == Namespace::HTML && document().document_type() == Document::Type::HTML)
m_html_uppercased_qualified_name = qualified_name().to_uppercase();
m_html_uppercased_qualified_name = DeprecatedString(qualified_name()).to_uppercase();
else
m_html_uppercased_qualified_name = qualified_name();
}