Might seem like a silly question, but I'm curious to know what other people have seen with their forums in terms of speed and reliability. How did you determine it was time to use a CDN setup? Are you still debating it like myself? I only have 450+ members on my forums. My site still runs relatively fast, but I always wonder if it could be a bit faster. Did you do some testing? Perhaps some comparisons? Any links to tools that could help? I would love the feedback and experiences you guys have about this.