What should be avoided in a Lightning page with a flow component?

Running the flow at the same time as page load is something that should be avoided because it can lead to performance issues and a poor user experience. When a flow is triggered immediately as the page loads, it requires processing resources and may result in delays in rendering the page content. If the flow takes time to load, users may experience a waiting period before they can interact with other components on the page. This can lead to frustration, particularly if the flow includes lengthy processes or user prompts. Therefore, it's generally better to run a flow based on user action, such as a button click, rather than automatically on page load.

While the other options concern flow design and user experience, they do not have the same critical impact on performance as running the flow simultaneously with the page load. For example, having multiple flows on a single page can complicate the user interface but is manageable in terms of performance if designed well. Using a dark theme for flow components does not inherently affect performance, and including large static resources can be problematic but is not as critical as the timing of flow execution concerning user interaction.