Performance of Google chrome vs nodejs (v8)?

Question

Example

     console.time("Test");
     for(var i=0; i <2500000; i +=1 ){
             // loop around
     }
     console.timeEnd("Test");

The above code runs faster in nodejs than google chrome. Why node.js is faster than google chrome both are using chrome v8 engine

Note

Average speed

 Google Chrome  - 1518.021ms 

 Node.js - 4 ms

Any idea about the difference execution speed?

Answer 1

In a web browser(Chrome), declaring the variable i outside of any function scope makes it global and therefore binds to window object. As a result, running this code in a web browser requires repeatedly resolving the property within the heavily populated window namespace in each iteration of the for loop.

In Node.js however, declaring any variable outside of any function’s scope binds it only to the module scope (not the window object) which therefore makes it much easier and faster to resolve.

We will get more or less same execution speed when we wrap the above code in function.