Controlling the load

HowI can(inwhich event) to control the loadingofpage elements(divs and elements created in design time) to display messagesinthe charge as"Loadingsection1", "Loading section 2", "Loading array of elements", "Loading section 3", "Loading images", etc.?

Now, with animated .gif in preloader I can't show information about loading process.

Is it possible toload or unloaddivsto free up memoryand optimizeloading andonlyload themwhen needed?

Tx.