Accessing a website is just your computer asking another computer to send it content: “hey computer at reddit.com, send me the data of your frontpage”.
That computer, much like yours, does not have infinite speed; it takes some time to figure out what data to send you (if the webpage is tailored to each user, say the facebook frontpage when you’re logged on), and sending it you.
If there’s too many computers asking for data, it just can’t keep up.
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