As with any setup, your performance is a combination of hardware and software. What Chuck was pointing out was that you might want to check into your server configuration to see if you can tweak out some more performance. Depending on how much your site grows, you may need to make some addition hardware changes, but I would look to ways in which to minimize your server load, including disabling some features within PhotoPost that can cause a bigger load on some servers (like ipcache'ing and new photo tracking for users).
Please do not PM me for support or sales questions. Thank you for your understanding.