[justizin]

It would be a pain in the ass, some sites might pull it off, most wouldn't. There's no network configuration-based solution as simple, straightforward, and noninvasive as a JS overlay.

[tokenizerrr]

What do you mean? Most major web servers can be easily configured to throttle connections.

https://httpd.apache.org/docs/trunk/mod/mod_ratelimit.html

http://nginx.org/en/docs/http/ngx_http_core_module.html#limi...

[thezilch]

And then you're having to hold Nx more connections open, which is not free.