What pc resources are used when bruteforcing ? I mean bruteforcing something online, not hashes. Do you need a good amount a RAM and a good CPU or it's just about the internet speed ?
Well, unless the site you are bruteforcing is potato, it will have rate limits locking you out after a few attempts. So the biggest resource will be the number of IP addresses you can get, to circumvent the lockout. (assuming IP is used to block)
If there is no limit, then it will likely be internet speed. Though under some extremely rare circumstances, it may be something else.