Simon Stuart yesterday posted a very interesting post on G+ that explains on this (edited) topic:
#Rendering I was having a conversation last night … with +David Berneda regarding rendering performance improvements for FireMonkey applications.
Specifically, custom drawing/rendering on a FireMonkey Canvas.I just want to summarize the points I raised, and some of the conclusions I’ve come to having been working with rendering in FireMonkey since the end of June this year.
–jeroen
via: Simon Stuart rendering performance improvements for FireMonkey applications. Specifically, custom drawing/rendering on a FireMonkey Canvas.
The Wiert Corner - irregular stream of stuff 