Going to next card

[jbv at mozik.fr]

Hi list,

I have a stack with 2 cards. Each card contains a custom datagrid
made of 2000 sub-groups, each sub-group containing a checkbox
and 6 fields. The content of these fields is updated via post
requests to a database on a remote server.
I also have a button on each card that allows users to go to
card 2 or back to card 1.
After the datagrid on cd 1 has been updated, it can take up to
10 seconds to go to cd 2. Same things for cd 2 to cd 1.
But after a couple of moves back and forth, it becomes instantaneous,
and remains so until the datagrid on one of the 2 cards is updated.

Questions :
- why such a delay to go to next card after an update of the datagrid ?
- is there a workaround ?

Thank you in advance.
jbv