Productivity soars when a computer and its users interact at a pace (<400ms) that ensures that neither has to wait on the other.

Takeaways

1. Provide system feedback within 400 ms in order to keep users’ attention and increase productivity.
2. Use perceived performance to improve response time and reduce the perception of waiting.
3. Animation is one way to visually engage people while loading or processing is happening in the background.
4. Progress bars help make wait times tolerable, regardless of their accuracy.
5. Purposefully adding a delay to a process can actually increase its perceived value and instill a sense of trust, even when the process itself actually takes much less time.

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So, the height and width is not fixed, and it is calculated dynamically according to the diminutions of the window. Under that div, there is another one that has the ID header “navigation bar”, the header is initially positioned relatively under div.fullscreen – however, I am trying to position it as Fixed when the top of the #header reaches the top of the browser window. So here is what I am playing around, it toggles the Fixed style, but it does not toggle it at the right place…