WAD-Analysis Item-Poor performance for new lines

Hi.

I use WAD7 for entering new records in IP.

According to our business requirements, in analysis item properties I have defined "Number of New Lines in Planning Queries" = 50.

After that I face before extremely poor performance - it takes about 1-2 minutes until the page has loaded (note that it is empty page - only new blank rows).

When I define new lines = 1 performance is very good (2-3 sec).

Does anybody know what could be the problem ?

Thanks.