I am planning on getting a server with LT for my proxies and other sites. I was wondering how you can optimize a server for running PHProxy/Happy Proxy. For that matter do cURL and PHP proxies use much CPU? I know that CGI proxies use more CPU but I was wondering how much CPU matters for a PHP cURL proxy.
It will be a matter of tuning your httpd once you have the sites up and running. There is no definite answer to your question. If you are running lots of busy proxies on a single machine then you will forking many new processes which can be CPU intensive too. There are many things you can do to tune your httpd (minimizing its memory footprint, tweaking the various settings in httpd.conf, even considering using a threaded MPM) but these are largely specific to your set up. Several people have posted general pointers on tweaking Apache in this subforum.
You're welcome. If you need specific help on tweaking Apache once you are up and running, let me know. Generally, if you are planning on running a good number of proxies from a single box then it is a good idea to have as much RAM as you can so that you do not choke the new process creation unduly.