Make a Paralell Button Pressing Software which Supports Proxies [Linux + BSD]

Hi, I need a multicore software which can press a button on a website many times. The button just says "here" and I need a software which can do this multiple times at the same time in parallel. I have multiple URLs so I would like the ability to specify the URL when I run the software. It must also be able to support many proxies at the same time with Proxy authentication. I want the software to be able to run the process at least 100 times in parallel but 1000 or 10000 would be preferable. I want the browser to be headless or not needed and I would prefer the software in general was CLI, but latter is not required. It can be written in Any Language or tech but it must run on Linux and preferably other UNIXs like BSD. I also would need the source code.
I tried UI vision but it lagged too much.