Smartview slow performance while opening planning webform

Hi Experts,

Two of the webforms(composite form and standard form), when opening via smartview, takes more than 3 mins just to open or refresh.

Currently did the below settings. Still no improvement. Kindly suggest.

But when we open directly via planning Or if i use adhoc analysis on webform, no issues. It just takes seconds. Issue is only when we open planning form.

1. Auto recover save is disabled

2. Checked Reduce excel file size & improve metadata storage

3. NoData/Missing label is pointed to NumericZero

4. Move formating on operations disabled

5. Number of undo actions set to 0

6. No other extensions are enabled

7. Cell styles are disabled