perf: optimize public properties access on componentProxy

packages/runtime-core/src/componentProxy.ts

@@ -94,6 +94,7 @@ export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
     // is the multiple hasOwn() calls. It's much faster to do a simple property
     // access on a plain object, so we use an accessCache object (with null
     // prototype) to memoize what access type a key corresponds to.
+    if (key[0] !== '$') {
       const n = accessCache![key]
       if (n !== undefined) {
         switch (n) {
@@ -118,6 +119,7 @@ export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
         // return the value from propsProxy for ref unwrapping and readonly
         return propsProxy![key]
       }
+    }
 
     // public $xxx properties & user-attached properties (sink)
     const publicGetter = publicPropertiesMap[key]