It's not about CPU power, it's about software. Just putting a mutex in the wrong place or doing serious computation in UI thread will get you jitters, no matter how fast your CPU is. People do smooth screen updates on Commodore 64s and real time audio on things that are basically microcontrollers.
for me it's literally every day. frames missed, jittery animations everywhere on top-of-the line phones, this drives me completely mad.
On devices with gigahertz multicore CPUs, gigabytes of RAM and fast flash memory, absolutely everything local should be 100% instant