os: pre-allocate the result array in cpus

Author: gurgunday

lib/os.js

@@ -22,6 +22,7 @@
 'use strict';
 
 const {
+  Array,
   ArrayPrototypePush,
   Float64Array,
   NumberParseInt,
@@ -140,10 +141,12 @@ function loadavg() {
 function cpus() {
   // [] is a bugfix for a regression introduced in 51cea61
   const data = getCPUs() || [];
-  const result = [];
+  const result = new Array(data.length / 7);
   let i = 0;
+  let resultIndex = 0;
+
   while (i < data.length) {
-    ArrayPrototypePush(result, {
+    result[resultIndex++] = {
       model: data[i++],
       speed: data[i++],
       times: {
@@ -153,7 +156,7 @@ function cpus() {
         idle: data[i++],
         irq: data[i++],
       },
-    });
+    };
   }
   return result;
 }