How can a site know how "powerful" a client's computer is? Through HTTP, or through JS, maybe you can somehow ..?

Question

PHP

Let's say it's easy to identify the client's browser, through the useragent, everyone knows this.
But is there any loophole to find out, say, how many cores, frequency (GHz) and how much RAM?
And if the client is weaker, then the site will be lighter, and if it is more powerful, then it will be of better quality ... On a lighter site, let's say there should be less advertising, especially Flash and GIFs flickering, otherwise if all this slows down, then the user certainly won't click , but will try to leave as soon as possible and with mats.

Answer 1

Why not leave the choice of site version to the client himself? He will have the idea that he is trusted, it is quite possible that out of curiosity he will look at both versions of the design and spend a little more time on your site. Is it really worth it to develop two versions of the design for this? Maybe it's better to think and stop at lightweight, but one? After all, they might even want to log in from a weak phone ...

Answer 2

Hmm ... Well, purely theoretically, run some complex calculations in JS and measure the execution time? But it will be necessary to separately check whether there is a correlation between the execution time and the power of the machine.

Answer 3

Already