What I have noticed with macOS Catalina is that my Mac Pro 2013 3.5 6-Core is running overall better with no graphic issues, including reduction in heat that use to come out of the top -
use to 'COOK' (pun) marshmallows over it . The fans do not go on (barely) and generally it is smoother...
but...
What I have noticed is that the processing and rendering in FCPX is
slower...meaning that it looks like they might have reduced the CPU power of the Mac Pro 2013 in Mac OS Catalina (throttling) to compensate ...
I also noticed this with my MacBook Pro 2018 i9 32GB RAM 1TD SSD.....($4,000+)with macOS Catalina...
Now..for a general computer (Mac Pro 2013) to do general work it is ok (NOT FOR THE PRICE I PAID)...BUT...for heavy processing...it is possible that apple crippled it some...
I am not sure what is better...faster processing with heat and fans on ...or...pitch quite system...reduced heat...BUT slower rendering times..
Since I work in FCPX a lot with my Mac Pro 2013, I might have to go back to macOS Mojave (or High Sierra) and see if rendering and processing time increases.
Maybe apple did this (good and bad)...but I suspect that they might have did this to get people to upgrade to the new Mac Pro 2019. I cannot afford to upgrade (bought Mac Pro 2013 in 2015 & bought the MacBook Pro 2018 a year ago), and I do like the smaller form and design since it meets my needs...
Anyone notice the slow down in rendering with macOS Catalina or is it just me...?