I hope that "memory improvement" means that HyperOS won't be as extremely aggressivly freeing memory all the time.
Example: With Firefox, even though I have set it as "no restrictions", is sometimes unusable because if I go to another app and back, the page refreshes, losing whatever I've been doing in that page.
It's especially bad when buying stuff, going to the bank app to confirm something, and then back, and things erroring out.
It happens with my 3 GB of RAM MIUI phone... And exactly the same on my 16 GB of RAM HyperOS phone.
One would expect that the 16 GB of RAM phone wouldn't need to be as aggressivly freeing RAM.
Very annoying.
Other than that, I'm extremely happy with my Xiaomi 15 Ultra.
But please, Xiaomi, fix that!