Calculate time takes to download javascript file

Connect and share knowledge within a single location that is structured and easy to search. I originally asked this question back in The accepted answer then was to use new Date. I am therefore changing the accepted answer to this one. In Node. Note: The string being passed to the time and timeEnd methods must match for the timer to finish as expected.

Use performance. This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user.

There may also be large incompatibilities between implementations and the behavior may change in the future. Besides browser support, performance. Which means we will get invalid results —like "negative timing"— when the user doesn't have an accurate system time:.

On Oct , my system clock went haywire and guess what I opened Gmail and saw all of my day's emails "sent 0 minutes ago ". And I'd thought Gmail is supposed to be built by world-class engineers from Google Set your system clock to one year ago and go to Gmail so we can all have a good laugh.

Google Spreadsheet's now function also suffers from this problem. The only time you'll be using Date is when you want to show the user his system clock time. Not when you want to get the time or to measure anything. If you need to get function execution time on your local development machine , you can either use your browser's profiling tools, or console commands such as console. All modern browsers have JavaScript profilers built-in.

These profilers should give the most accurate measurement as you do not have to modify your existing code, which could affect the function's execution time. Alternatively, on your development machine , you can add instrumentation to your code with console. Note that only Firefox returns the elapsed time in the timeEnd call. The other browsers simply report the result to the developer console: the return value of timeEnd is undefined.

If you want to get function execution time in the wild , you will have to instrument your code. You have a couple options. You can simply save the start and end times by querying new Date. However, the Date object only has millisecond resolution and will be affected by any OS's system clock changes.

In modern browsers, there's a better option. The better option is to use the High Resolution Time , aka window. It returns the number of microseconds in the fractional e. This is important as Date. Notably, if the OS's system time is updated e. The exception is that Date and now times don't mix, as Date is based on unix-epoch the number of milliseconds since , while now is the number of milliseconds since your page navigation started so it will be much smaller than Date.

There are also several polyfills available. One other option for measuring execution time in the wild is UserTiming. UserTiming behaves similarly to console. UserTiming has the concepts of marks timestamps and measures durations. You can define as many of either as you want, and they're exposed on the PerformanceTimeline. To save a timestamp, you call mark startMarkName. To get the duration since your first mark, you simply call measure measurename, startMarkname. The duration is then saved in the PerformanceTimeline alongside your marks.

There is also a polyfill available which I wrote. To get precise values you should use Performance interface. Here's an example of how it can be used:. You can use them if quick rough estimate is OK for you. By rough estimate I mean you can get ms shift from the real time. Check this brilliant post on measuring execution time in JavaScript. The author also gives a couple of links about accuracy of JavaScript time, worth reading. Use Firebug, enable both Console and Javascript.

Click Profile. Click Profile again. View the report. To extend vsync's code further to have the ability to return the timeEnd as a value in NodeJS use this little piece of code. This gives you more possibilities. You can store the execution time to be used for more purposes like using it in equations, or stored in a database, sent to a remote client over websockets, served on a webpage, etc.

Here's what happens when you apply the unary plus operator to a Date instance: Get the value of the Date instance in question Convert it to a Number. If you're using async functions you can make timed async and add an await before f It gets more complicated if you want one decorator to handle both sync and async functions.

Since console. IE10 , I created a slim utility that utilizes the best available methods. However, it lacks error handling for false usages calling End on a not initialized timer. Please, note, that you shouldn't do anything apart from what you want to measure for example, console. For example,. Download time depends upon mostly two factors. First, the internet speed of your connection. Secondly your file size. Download calculator will help you to estimate download time for your file. In order to know how long will the download take, you need to enter the size of your file.

You will see estimated download time for your file on multiple connections. To know your internet speed, you can use speedtest. According to your current speed, It would take you about. NOTE: Read our information on how download transfer works to get better overview. NOTE : The download time calculator is used for estimating download time for a file.

It is just an estimation. It is based on your own internet speed. In order to know exact speed of your internet connection go to speed test.

Syntax: Hey geek! The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof.

But before you tackle the big projects, we suggest you start by learning the basics. Now at it's lowest price ever! The output would be displayed on the console. Skip to content. Change Language. Related Articles. Table of Contents. Improve Article.

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