This code for these urls is generated by IDX Broker, and used to display the widgets. You can’t directly modify ALL of the CSS and JS to minify this code. It is possible to copy/cache the widget code and then minify the code, however I find its probably not worth the effort, especially since they may change frequently as properties change, etc. I do have an open request related to this which is specific for IDX Broker to improve widget performance:
I also noticed this site you mentioned is using the Agent Evolution Turnkey-Slider theme. My company has actually modified this theme to create a custom version we use for our clients. On average just by switching to the theme we customized, users can get up 1 to 2 seconds of improved performance.
Easy Tip: Each widget has a custom css section you can edit, you can very easily minify the css in this feature for each widget. Edit your widget, copy out the css and use a site or tool like http://csscompressor.com to minify the css, and then paste back into your widget replacing the original css code.


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