add .query memoization for ultimate hello world benchmarks

benchmarks/middleware.js

@@ -11,7 +11,6 @@ console.log('  %s middleware', n);
 while (n--) {
   app.use(function(next){
     return function *(){
-      var p = this.path;
       yield next;
     }
   });

benchmarks/run

@@ -6,7 +6,7 @@ pid=$!
 
 sleep 2
 
-wrk http://localhost:3000/ \
+wrk 'http://localhost:3000/?foo[bar]=baz' \
   -r 2000 \
   -c 50 \
   -t 4 \

lib/context.js

@@ -142,7 +142,7 @@ module.exports = {
    */
 
   get path() {
-    var c = this._pc = this._pc || {};
+    var c = this._pathcache = this._pathcache || {};
     return c[this.url] || (c[this.url] = parse(this.url).pathname);
   },
 
@@ -169,7 +169,9 @@ module.exports = {
   get query() {
     var str = this.querystring;
     if (!str) return {};
-    return qs.parse(str);
+
+    var c = this._querycache = this._querycache || {};
+    return c[str] || (c[str] = qs.parse(str));
   },
 
   /**