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Utilizing whitelisting for specific vendor IP addresses can help improve performance issues caused by high traffic by prioritizing access for critical vendors or partners. This approach allows certain IP addresses to access network resources more freely, potentially reducing congestion from less critical traffic. By controlling who can access the website and ensuring that those with the highest priority can connect without hindrance, it can optimize the site's performance during peak times.

In the context of the other options, implementing VPN access for all users could unnecessarily complicate access and may not address performance issues caused by traffic overload. Contacting the internet service provider for bandwidth upgrades is a longer-term solution that may take time to implement and may not resolve immediate performance problems. Disabling the website temporarily can lead to downtime and a loss of service, which is not ideal for maintaining user engagement and business operations. Thus, whitelisting offers a targeted, efficient method for managing peak traffic while keeping essential services active.