The way you said it originally made it sound more like they simply don't think it matters. I think what you really mean is what you said here. They are newbie

The way you said it originally made it sound more like they simply don't think it matters. I think what you really mean is what you said here. They are newbies when dealing with high volume sites where page load time is critical. IMO, that's a very different statement. One is a difference in experience with a domain, the other is ideological.