perf fixes

Author: guybedford

test/perf.html

@@ -7,7 +7,7 @@
     System.set('module0', System.newModule({}));
     System.instantiate = function(load) {
       return {
-        deps: ['module1'],
+        deps: ['module' + (load.name.substr(6) - 1)],
         execute: function() {
           eval(load.source);
           return System.newModule({});
@@ -21,7 +21,7 @@
       for (var i = 1; i <= 1000; i++)
         System.define('module' + i, "function q() {} var p = 5;\n // non-trivial code");
       System.import('module1000').then(function() {
-        document.body.innerHTML = (Date.now() - startTime) + 'ms';
+        document.body.innerHTML = ((Date.now() - startTime) / 1000) + 'ms per module';
       }).catch(function(e) {
         setTimeout(function() {
           throw e;