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How do I find out how long a script took to run in the Firefox console? [duplicate]

How to measure time taken by a function to executeHow do you find out the caller function in JavaScript?How do I find out which DOM element has the focus?How can you profile a Python script?Improve INSERT-per-second performance of SQLite?Sound effects in JavaScript / HTML5How do I manually fire HTTP POST requests with Firefox or Chrome?How to detect Safari, Chrome, IE, Firefox and Opera browser?Violation Long running JavaScript task took xx msHow to log a deeply nested Object as it is in node consoleWhy is if (variable1 % variable2 == 0) inefficient?

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2

This question already has an answer here:

• 
  How to measure time taken by a function to execute
  
  26 answers
  
  

When I want to figure out how fast my JavaScript is I usually resort to "estimating" how fast it appears to be, this is extremely inefficient and most times I'm outright wrong.

In Ubuntu when you want to tell how long a program took to run, you'd use the time command like this:

time script_name.py

The output would look like this:

program output....

real 0m0.123s
user 0m0.123s
sys 0m0.123s

How can I get FireFox to show me similar information in the browser console?

NOTE: I'm using the latest version of FireFox & Lubuntu 18.04 (LTS).

javascript performance firefox time

share|improve this question

edited Apr 3 at 13:01

LogicalBranch

asked Mar 26 at 8:15

LogicalBranchLogicalBranch

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marked as duplicate by mplungjan javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

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Mar 26 at 8:25

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Minimum effort please
  
  – mplungjan
  Mar 26 at 8:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Noted, thanks for the heads up.
  
  – LogicalBranch
  Mar 26 at 8:27
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Note that Firefox specifically does not optimize code ran from the dev-tools js console. Do not measure function performance from there, always do in real conditions, that is from your own page.
  
  – Kaiido
  Mar 26 at 8:29
  

  
  
  
  

add a comment | 

2

This question already has an answer here:

• 
  How to measure time taken by a function to execute
  
  26 answers
  
  

When I want to figure out how fast my JavaScript is I usually resort to "estimating" how fast it appears to be, this is extremely inefficient and most times I'm outright wrong.

In Ubuntu when you want to tell how long a program took to run, you'd use the time command like this:

time script_name.py

The output would look like this:

program output....

real 0m0.123s
user 0m0.123s
sys 0m0.123s

How can I get FireFox to show me similar information in the browser console?

NOTE: I'm using the latest version of FireFox & Lubuntu 18.04 (LTS).

javascript performance firefox time

share|improve this question

edited Apr 3 at 13:01

LogicalBranch

asked Mar 26 at 8:15

LogicalBranchLogicalBranch

2,26522 gold badges99 silver badges4040 bronze badges

marked as duplicate by mplungjan javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
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StackExchange.helpers.removeMessages();

);
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Mar 26 at 8:25

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Minimum effort please
  
  – mplungjan
  Mar 26 at 8:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Noted, thanks for the heads up.
  
  – LogicalBranch
  Mar 26 at 8:27
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Note that Firefox specifically does not optimize code ran from the dev-tools js console. Do not measure function performance from there, always do in real conditions, that is from your own page.
  
  – Kaiido
  Mar 26 at 8:29
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  How to measure time taken by a function to execute
  
  26 answers
  
  

When I want to figure out how fast my JavaScript is I usually resort to "estimating" how fast it appears to be, this is extremely inefficient and most times I'm outright wrong.

In Ubuntu when you want to tell how long a program took to run, you'd use the time command like this:

time script_name.py

The output would look like this:

program output....

real 0m0.123s
user 0m0.123s
sys 0m0.123s

How can I get FireFox to show me similar information in the browser console?

NOTE: I'm using the latest version of FireFox & Lubuntu 18.04 (LTS).

javascript performance firefox time

share|improve this question

edited Apr 3 at 13:01

LogicalBranch

asked Mar 26 at 8:15

LogicalBranchLogicalBranch

2,26522 gold badges99 silver badges4040 bronze badges

time script_name.py

program output....

real 0m0.123s
user 0m0.123s
sys 0m0.123s

share|improve this question

edited Apr 3 at 13:01

LogicalBranch

asked Mar 26 at 8:15

LogicalBranchLogicalBranch

2,26522 gold badges99 silver badges4040 bronze badges

share|improve this question

edited Apr 3 at 13:01

LogicalBranch

asked Mar 26 at 8:15

LogicalBranchLogicalBranch

2,26522 gold badges99 silver badges4040 bronze badges

asked Mar 26 at 8:15

LogicalBranchLogicalBranch

2,26522 gold badges99 silver badges4040 bronze badges

asked Mar 26 at 8:15

LogicalBranchLogicalBranch

2,26522 gold badges99 silver badges4040 bronze badges

1 Answer
1

active

oldest

votes

3

Various options for you.

1. 
   

   You can put

   
   
   

   console.time("program");
   

   
   
   

   at the beginning and

   
   
   

   console.timeEnd("program");
   

   
   
   

   at the end. It'll tell you the elapsed time between those two calls.

   
   



2. If you're looking for the relative performance of two fairly smallish code snippets, there are various online tools that will do that for you (https://jsperf.com, http://jsben.ch).



3. 
   

   If the code doesn't involve browser-specific things, you can use Node.js in your terminal to run your code, and use time on it as usual.

   
   
   

   None of the above is specific to Firefox.

   
   



4. In the Firefox dev tools specifically, there's a Performance tab you can use to measure performance of specific things in a web page. This page on mozilla.org covers it.

share|improve this answer

edited Mar 26 at 8:22

answered Mar 26 at 8:17

T.J. CrowderT.J. Crowder

723k133133 gold badges13051305 silver badges13791379 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for taking the time to answer my question, I've tried the first three recommendations, and they all work as expected, thank you!
  
  – LogicalBranch
  Mar 26 at 8:24
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  developer.mozilla.org/en-US/docs/Mozilla/Performance/… try this too
  
  – deviprsd
  Mar 26 at 8:27
  

  
  
  
  

add a comment | 

3

Various options for you.

1. 
   

   You can put

   
   
   

   console.time("program");
   

   
   
   

   at the beginning and

   
   
   

   console.timeEnd("program");
   

   
   
   

   at the end. It'll tell you the elapsed time between those two calls.

   
   



2. If you're looking for the relative performance of two fairly smallish code snippets, there are various online tools that will do that for you (https://jsperf.com, http://jsben.ch).



3. 
   

   If the code doesn't involve browser-specific things, you can use Node.js in your terminal to run your code, and use time on it as usual.

   
   
   

   None of the above is specific to Firefox.

   
   



4. In the Firefox dev tools specifically, there's a Performance tab you can use to measure performance of specific things in a web page. This page on mozilla.org covers it.

share|improve this answer

edited Mar 26 at 8:22

answered Mar 26 at 8:17

T.J. CrowderT.J. Crowder

723k133133 gold badges13051305 silver badges13791379 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for taking the time to answer my question, I've tried the first three recommendations, and they all work as expected, thank you!
  
  – LogicalBranch
  Mar 26 at 8:24
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  developer.mozilla.org/en-US/docs/Mozilla/Performance/… try this too
  
  – deviprsd
  Mar 26 at 8:27
  

  
  
  
  

add a comment | 

3

Various options for you.

1. 
   

   You can put

   
   
   

   console.time("program");
   

   
   
   

   at the beginning and

   
   
   

   console.timeEnd("program");
   

   
   
   

   at the end. It'll tell you the elapsed time between those two calls.

   
   



2. If you're looking for the relative performance of two fairly smallish code snippets, there are various online tools that will do that for you (https://jsperf.com, http://jsben.ch).



3. 
   

   If the code doesn't involve browser-specific things, you can use Node.js in your terminal to run your code, and use time on it as usual.

   
   
   

   None of the above is specific to Firefox.

   
   



4. In the Firefox dev tools specifically, there's a Performance tab you can use to measure performance of specific things in a web page. This page on mozilla.org covers it.

share|improve this answer

edited Mar 26 at 8:22

answered Mar 26 at 8:17

T.J. CrowderT.J. Crowder

723k133133 gold badges13051305 silver badges13791379 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for taking the time to answer my question, I've tried the first three recommendations, and they all work as expected, thank you!
  
  – LogicalBranch
  Mar 26 at 8:24
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  developer.mozilla.org/en-US/docs/Mozilla/Performance/… try this too
  
  – deviprsd
  Mar 26 at 8:27
  

  
  
  
  

add a comment | 

Various options for you.

1. 
   

   You can put

   
   
   

   console.time("program");
   

   
   
   

   at the beginning and

   
   
   

   console.timeEnd("program");
   

   
   
   

   at the end. It'll tell you the elapsed time between those two calls.

   
   



2. If you're looking for the relative performance of two fairly smallish code snippets, there are various online tools that will do that for you (https://jsperf.com, http://jsben.ch).



3. 
   

   If the code doesn't involve browser-specific things, you can use Node.js in your terminal to run your code, and use time on it as usual.

   
   
   

   None of the above is specific to Firefox.

   
   



4. In the Firefox dev tools specifically, there's a Performance tab you can use to measure performance of specific things in a web page. This page on mozilla.org covers it.

share|improve this answer

edited Mar 26 at 8:22

answered Mar 26 at 8:17

T.J. CrowderT.J. Crowder

723k133133 gold badges13051305 silver badges13791379 bronze badges

share|improve this answer

edited Mar 26 at 8:22

answered Mar 26 at 8:17

T.J. CrowderT.J. Crowder

723k133133 gold badges13051305 silver badges13791379 bronze badges

answered Mar 26 at 8:17

T.J. CrowderT.J. Crowder

723k133133 gold badges13051305 silver badges13791379 bronze badges

answered Mar 26 at 8:17

T.J. CrowderT.J. Crowder

723k133133 gold badges13051305 silver badges13791379 bronze badges