Is that possible to delay UpdatePanel update on the client side?

I have an old system which uses UpdatePanels of asp.net

After the postback is completed, we know that the inside of UpdatePanel is updated

Can i delay this update somehow on the client side ? is that possible?

So it will be like, when the postback is started, i set a javascript datetime object on the client side

Once the postback is completed, and the data is returned from the server, before updating the client side interface, i check how many miliseconds has passed and I delay the update of the client side until certain miliseconds has passed

is this possible?

asp.net 4.5 c#