Question

I use a website which has a very high response time. Most of the time is taken to load a page with its javascript and css files.

I want to write a Google Chrome extension which can save/cache all the js files for a really long time.

I know JS on its own would not provide me this feature. Does google chrome have an api to do the same?

Are there any other options ?

Answer 1

It doesn’t sound like a good idea

• Do you expect people to install this extension, for the sole purpose of visiting your site? I visit hundreds of sites regularly, should I install hundreds of extensions?
• Will you also make an extension for Firefox / Opéra / Safari / whatever browser I like?

If the webserver correctly places the HTTP headers, the browser (Chrome and all others) will cache all resources correctly.

See How can I improve loading times on a static HTML site?

Edit: Now that I better understand your need, what you can do is create an extension that

• is applied on the site in question
• removes the script/css loading, for instance $('head>stylesheet').remove()
• injects the same script/css with a local copy, and optionally improves the loading of script with $(document).ready(main_function) (rather than <body.onload="main_function()">)