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[–] SkepticalMartian 0 points 6 points (+6|-0) ago  (edited ago)

If it's set up properly you don't even notice. Static files get cached. What slows sites down more than anything is ads, because they typically get aggregated from providers and are dynamically loaded off site so they can't be cached. This is why ad blockers can have such a profound improvement on the browsing experience.

Javascript often isn't the bottleneck unless it's written really badly and you're running it on a potato. For example, here's a voxel engine demo written solely in javascript. Javascript performance in modern browsers is actually very good. If you're curious about what is making a site slow, open the developer tools console in chrome (more tools -> developer tools) select the network tab and reload the page. It will time every resource and tell you exactly what is being slow. Pay particular attention to the status of each resource. Anything with status 304 is a cached resource and it's being loaded from your computer locally.

[–] [deleted] ago 

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[–] SkepticalMartian ago  (edited ago)

well, it's one thing that it's for. It does a lot more, but honestly it's usually only useful to devs. Regular people don't normally have cause to poke around in there.