General performance improvements for folks using compat (#4459)

compat/src/render.js

@@ -33,7 +33,6 @@ const CAMEL_PROPS =
 	/^(?:accent|alignment|arabic|baseline|cap|clip(?!PathU)|color|dominant|fill|flood|font|glyph(?!R)|horiz|image(!S)|letter|lighting|marker(?!H|W|U)|overline|paint|pointer|shape|stop|strikethrough|stroke|text(?!L)|transform|underline|unicode|units|v|vector|vert|word|writing|x(?!C))[A-Z]/;
 const ON_ANI = /^on(Ani|Tra|Tou|BeforeInp|Compo)/;
 const CAMEL_REPLACE = /[A-Z0-9]/g;
-
 const IS_DOM = typeof document !== 'undefined';
 
 // Input types for which onchange should not be converted to oninput.
@@ -135,6 +134,7 @@ function handleDomVNode(vnode) {
 		type = vnode.type,
 		normalizedProps = {};
 
+	let isNonDashedType = type.indexOf('-') === -1;
 	for (let i in props) {
 		let value = props[i];
 
@@ -164,21 +164,23 @@ function handleDomVNode(vnode) {
 			value = '';
 		} else if (lowerCased === 'translate' && value === 'no') {
 			value = false;
-		} else if (lowerCased === 'ondoubleclick') {
-			i = 'ondblclick';
-		} else if (
-			lowerCased === 'onchange' &&
-			(type === 'input' || type === 'textarea') &&
-			!onChangeInputType(props.type)
-		) {
-			lowerCased = i = 'oninput';
-		} else if (lowerCased === 'onfocus') {
-			i = 'onfocusin';
-		} else if (lowerCased === 'onblur') {
-			i = 'onfocusout';
-		} else if (ON_ANI.test(i)) {
-			i = lowerCased;
-		} else if (type.indexOf('-') === -1 && CAMEL_PROPS.test(i)) {
+		} else if (lowerCased[0] === 'o' && lowerCased[1] === 'n') {
+			if (lowerCased === 'ondoubleclick') {
+				i = 'ondblclick';
+			} else if (
+				lowerCased === 'onchange' &&
+				(type === 'input' || type === 'textarea') &&
+				!onChangeInputType(props.type)
+			) {
+				lowerCased = i = 'oninput';
+			} else if (lowerCased === 'onfocus') {
+				i = 'onfocusin';
+			} else if (lowerCased === 'onblur') {
+				i = 'onfocusout';
+			} else if (ON_ANI.test(i)) {
+				i = lowerCased;
+			}
+		} else if (isNonDashedType && CAMEL_PROPS.test(i)) {
 			i = i.replace(CAMEL_REPLACE, '-$&').toLowerCase();
 		} else if (value === null) {
 			value = undefined;