When doing your calculations, remember that anti-aliasing increases the number of pixel values to calculate, and adds a stage to reduce back down to the physical pixels. In a TV targeted font rendering system I worked with, the manufacturer estimated that they calculated 16 logical pixels for every physical pixel.
Responsiveness has improved for me (although I've been buying more expensive machines over time), but I've also gone from 800x600x8bit (so just under 500kiB of frame buffer to fill) to 1440x900x32bit (so nearly 5MiB of frame buffer to fill), and switched on anti-aliasing, driving the new figure up to 40MiB of pixel data to calculate in the worst case, assuming the numbers from my past still apply.
The big difference I've noticed is not responsiveness when idle (which has always been beyond my ability to measure), but responsiveness under load. Instead of having my machine grind to a halt for 30 seconds when I print a photo, or compile software, I get to continue working unaffected, and background tasks complete faster - this is a win/win for me.
Copyright © 2018, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds