Adding more than 4gb ram is mind blowing

So today I finally switched the 4gb stick for a 16gb Stick for a total amount of 20gb on my ds920+ and... I really didn't expected these results... I'm using Ds Files on my phone to show friends old pictures and with 8gbs after clicking on a file the screen was black for like 10 seconds each... And now???? Freaking instantly.. so anyone who's still using 4 or 8gbs on their Nas, this is your wake up call to buy that cheap 16gb ram stick!