Slow down connection for Browser for testing [duplicate]

I am developing a JS+CSS+HTML Webapplication that is deployed on a local Apache. For debudding, I want to simulate a slow connection.

What is the best way to do that? I am not looking for a way to slow down my actual connection, just the loading this page (e.g. a Chrome/Opera Extension or an Apache module)

Can you slow down WIFI for other users?

To limit internet speed on other wifi users we will need a browser and an active wifi router. To limit the speed of other users we have to set a new rule to the router. It doesn't matter which company router you use, every router provides this functionality.

Turn on developer mode and then go to enter image description here network tab, you will be able to see the throttling option drop-down option, change the network type from there. See the screenshot.