Extjs 4.1.1a performance with grid.Render() on IE9

[ctiollier]

Hello,
For my test I have used the basic example in ext-4.1.1a\examples\grid\array-grid.js I have just modified this lines (comment the renderTo in grid and add the grid.Render() + time execution calculation) :

...
var grid = Ext.create('Ext.grid.Panel', {
   ...
   //renderTo: 'grid-example',
   ...
});
var start = new Date().getTime();
grid.render('grid-example');
var stop = new Date().getTime();
var executionTime = stop - start;
console.log(executionTime);

The result are :
IE9 : ~3000ms
IE8 : ~150ms
FF v16.0.2: ~80ms
Chrome v23: ~60ms

I don't have a support licence, in can't test if 4.1.2 or 4.1.3 solved this performance issue that are unacceptable for my client who use IE9, and I can't force them to use FF or Chrome.

[fpaillard]

Same problem here, we're experiencing initialization problems with grids under Internet Explorer 9 and ExtJS 4.1.1a...

[zonereseau]

Hi,

I've just tried with 4.1.1a and 4.1.3 with IE9 using WAMP as a webserver and directly with the file:// protocol and I got between 43 to 50ms.

Without webserver it's slower a bit probably because IE is trying to verify the security of the javascript file differently.

I'm on Windows 7 with an I7 processor and a lot of RAM running on a SSD disk so maybe the performance issue is elsewhere?

[ctiollier]

Hello and thank you for your answer.
Well I have found the problem it's our Antivirus (Avast web and script agent) who was installed on all our pc that whas causing the problem.
I feel stupid to not have thought about this before posting.