Datawindow N-UP slow performance

Hi everyone ,

I have a bit confusing performance problem with N-up datawindow , hope someone can help with with ideas

The extact Problem is :

     Datawindow is [slow] while doing : a click , item-focus-changing , row-focus-changing:

     Example : It takes a second ( bit more or less ) just to move from one field to another

     This happen when I run from executable app. file .

     But it's [Fast] when I run from Powerbuilder IDE

Here's is how I created this datawindow :

1. Iam using PowerBuilder 11.5 , back end is SQL server 2008.
2. I Created N-UP datawindow with 45 rows per detail band.
3. Datawindow retrieves around 2000 rows.
4. Datawindow has many (simple) expression to change the back color of columns ( which are my 45 N rows per detail ) based on data fields retrieved.

Things I have tried :

I removed all script from the above related events - NO EFFECT

I simplified the expressions of row to do color changing ( replace RGB with a number ...etc )- NO EFFECT

I removed the expressions - NO EFFECT !!!

What else I should try or do ?!

Is it about the native behavior of datawindow itself , or something is wrong with what i did ?!