If dynamic content is used in an email, at the time of send, the click-to-view link matches what is displayed in the email.
However, after the send, if the contact record is updated, the click-to-view link will show the most up-to-date dynamic content. This happens because the system verifies the database before it displays the click-to-view to ensure that it shows the correct content at that moment.
If a click-to-view link takes more than 30 seconds to load, the system generates the error message Display error, contact administrator. A click-to-view evaluates the logic in an email body, including dynamic content and relational table markup, so if the rule criteria and data sources are very large and complex, generating a single email body for click-to-view can take more than 30 seconds. This feature is to prevent click-to-view links from degrading overall system performance. For example, you send a large email with complex rules to a million people, and 50 recipients immediately click the click-to-view link that requires a long time to evaluate the rules and markup. If these requests are allowed to process with no time out logic, it could lead to database contention and degraded performance.