“Loading bar” completes and disappears before the data is completely loaded ,

“Loading bar” completes and disappears before the data is completely loaded,

It is very common that the loading bar completes ad disappears while the data is still not loaded. This is very confusing for the end user

/customer/servlet/servlet.FileDownload?file=00P6000000em1iFEAQ

How to keep the “loading bar” on the screen as the data is still unloaded completely.

Thank you

Best

Jamal