How to improve the performance of a website to load in less than 1 second

That's very easy. Just get rid of bloatware.

Anything that uses JS is intrinsically bloated and useless so get rid of that. People who say that JS is useful for having dynamic content and live updates on a webpage are ignorant and uneducated. All you're doing is essentially reinventing commercial television which is dumb because we all know that television is a propaganda machine that has no place on the modern web.

A webpage should be a simple HTML+CSS file. The header must contain a short paragraph stating the purpose of the webpage in a clear and concise manner. The author must also leave his/her IRC handle as well as the channel+server in which they could be found at the bottom of the page in case if anyone would want to contact them to give feedback about the webpage. The content of the page should be written in a standard font and the text should be stretching from the left-most side of the monitor all the way to the right-most side without any margin. This is the way to achieve maximum monitor utilization. If you're a real web developer, you'd know that all this can be achieved without CSS so go ahead and remove any CSS from your webpage to further debloat it. At the end of the day, nobody cares about your cute little styles and kinky background colours. The most important part of a webpage is the information that it presents, not some stupid eye candy.

If you want to go even further to optimize your site, you will realize that HTML is actually very bloated as well. A standard ASCII text file can be used to display information equally well (if not better) compared to HTML. Unicode is unnecessary because any foreign script can be latinized. At this point, you will also realize that having a whole ass HTTP server to serve a single text file is kind of dumb so the next thing you should do is uninstall all HTTP servers from your host. You can setup a script to continuously listen on some TCP port and transmit the text file whenever anyone connects. Some may argue that this will only allow a single user to view the text file at a time. This is true, but it's not like you have many users on your site anyways, right? Additionally, if anyone really needs the info from you and can't wait, then they can always phone you and request a mail to be sent with the print out of your webpage/text file (assuming your phone number is available in the user's phone book).

One last thing you can do to achieve the most out of your debloating operation is to remove your site from the internet completely. There is no point in having a wide audience all over the globe anymore. No one cares about the dumb shit that you say online. Nowadays, everything is about interacting with AI girlfriends which can be run locally thus making the internet useless.

There may still perhaps be a few people who respect you and want to hear what you have to say, so you can still connect to them by utilizing this amazing new technology called the "pantelegraph". With the pantelegraph, you can transmit scans of written and printed documents over standard telegraph lines. Just write whatever you want on a piece of paper, pass it through the pantelegraph, and then it will transmit the data over to the other end of the line where the document will be printed out. Make sure that all the people you want to connect to purchase a pantelegraph and that there is a functioning telegraph line between you and you're good to go.

I hope my little guide helped you gain some additional insights about website optimization. If you love what I write and would like to support me, please consider buying me a coffee (cappuccino, medium sweetness).