It really depends on what those users are being served, it they are getting static html pages then a hell of a lot - if you're looking at hosting unix images then speed is going to be greatly effected.
Also, a lot of it comes down to how the server is configured, if you use default values for everything its not going to run as quick as it could.
You should let people know what you intend on serving, what software you'll be using on the server etc.
███ The Simple Host Ltd - Premium Quality European Web Hosting - Uptime Stats
███ Shared, Reseller, VPS & Dedicated Hosting
███ 15-Day Money Back Guarantee, Nightly Backups, Installatron, Softaculous, RVSiteBuilder PRO, Instant Setup - All as standard!
███ Call (+44) 0845 300 9066 for more information.