Okay, so I've noticed the recently added Railgun feature, and think my site may benefit from it.
However, the feature requires a program running on or near the origin server, and I'm wondering who is actually responsible for that program; is it a general Dreamhost feature running on separate machines, or does it run within a user's account, and thus count towards their hardware resource usage (CPU and memory)?
Also, has anyone tried comparing it to using GZIP compression on a site? My site currently GZIPs everything it sends, which I presume I'd need to turn off in order to use Railgun (or at least should since compressing between my server and the Railgun program seems redundant). If the Railgun program is just a service within Dreamhost's data centres then it could benefit sites that can disable GZIP, but if it runs within our hosting account then I'm uncertain how much of a benefit it would really give in practice as while it could be better than GZIP (since compression is shared between visitors), it's not clear what the resource requirements are.