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Progress Bar freezes

Hello,

I'm using the newest dhtmlXGrid (1.6). I have attached to my grid, according to some knowledge base articles, the events onXLS and onXLE. The events are raised - no problem. What I do is showing and hiding a div - it works, but in this div I have placed an animated gif showing the progress bar - and here the game begins - while loading data the gif freezes - it doesn't animate itself at all. What is the reason and how to fix it ??

Greetings

There is nothing special in grid processing which can freeze gif animation, but the next may occur. 
The data loading consists from two phases
 - data loading
 - rendering grid based on incoming data
while first phase doesn't use CPU, second phase requres a lot of calculation, and may eat all available resources, so browser will pause updates , which will result in gif freezing.