'Is there a way to simulate / slow down asset loading in Rails?

I want to test a site in Rails as if it had a very slow internet connection, the js loads in 10 seconds after the page for example.

Is there a way to slow down the url for this for example:

<%= javascript_include_tag 'application' %>

All Google results cover slow load page times and how to speed them up, I'm finding it quite hard to Google how to do this.

ruby-on-rails assets

Solution 1:^[1]

On what device?

Simulate the situation I would say.

Connect the device to your phone as a hotspot and then choose the lowest speed on your phone for that device.
Visit ( GET ) via opera browser on vpn that is far from your location and secured, this slows down dramatically.
Visit your website via Tor browser
Do the 3 above at the same time.

Bonus: Go to starbucks, get the wi-fi connection and go sit as far as possible with losing basic connection.

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Solution	Source
Solution 1	Kim Van Rompay