The Preload Time is set in the layer's Inspector and can be set differently for each Layer. The specified time defines how many seconds on the Timeline Pixera's render engine looks ahead of the Nowpointer to preload content. Preloading minimizes the risk of media files not being fully loaded at the moment they should be played back, which may result in bad performance. On the other hand, more preload time also increases the memory and computing demand of the project. Therefore, try to balance this value according to the complexity of the content.