jQuery Grid Plugin - jqGrid

Hello guys

I need some ideas of how I am going to speed up jqgrid. The label "Loading" is appeared for at least 6 seconds. I have searched over the internet and everyone's answers focus on how many records are displayed. But I don't have many records to display.

Details:

1) The server is local.

2) I have many collumns that I need to perform some extra operations after click on them. What I mean: For example, I have 4 collumns that are telephone1, telephone2, mobile, fax. When someone click at a number, a modal window appears, for him to choose if he wants to sent a fax or a sms to this number. Plus, I have 7 collumns that appears only a button, which when someone clicks on it, it appears a modal window too. 

3) Total Records to display > 500. Collumns to display = 161

4) I have set $grid->dataType = 'json';

I know that the source of my problem is what I am describing at 2), but I really need these extra operations. Any ideas, please?