Define "slow." Apache is a web server, or rather, an http daemon. I'm also confused by the term "my ISP's Apache" and not sure what you mean by that. If you have an httpd.conf file, then it's your Apache, I would think. You shouldn't have access to your ISP's httpd.conf file!
Are you running Apache from your server? Then your speeds, upload and download, are determined by your pipe, that is, your speed connection type. Too many factors to list on this, ATM, PPPoE, QoS, all other kinds of variables involved, not to mention you own configuration.
What is your connection type and speed?