How to use carbon VPN?

Can you explain in detail how to effectively use Carbon VPN? Perhaps you could start by outlining the initial setup process, including downloading the software and creating an account. Then, could you guide us through connecting to a server and navigating the various options and features available? Additionally, it would be helpful to discuss any potential security concerns and how Carbon VPN addresses them. Lastly, could you provide some tips for optimizing the VPN connection for faster speeds and better performance?