In my case it wasn’t that bad, but still quicker than I expected, while investigating some freezes I came across the type of idle - s2idle vs deep - s2idle is the default and it doesn’t shut off the memory. Perhaps it’s related to the memory you are using?
I wrote some more details here at the time: Laptop12 w/ KUbuntu 25.04 freezing when suspending - #6 by Guido_Vezzoni