In any M-series family, I’ve always assumed that P and E cores were the same, whether it’s a base or Ultra variant. That isn’t correct, though.
performance
Low Power mode operates pre-emptive control of CPU core frequency to deliver the best compromise between low power use and performance. Here’s how it does so.
How CPU P cores have a frequency limit applied in Low Power mode, and how macOS regulates power use or temperature by controlling core frequency.
How Apple silicon CPUs control core frequencies and power use when running in Low Power mode. Includes M4 Pro and M3 Pro data, and estimates of energy requirements.
Apple refers to Energy Modes and Power Modes, and despite older MacBook Pro models offering Low Power mode, tells us that isn’t what Low Power mode is now. Here are the observations and explanations.
Does your NAS need faster storage or a faster network? If you were to improve those, would throttling limit the performance of backups?
It’s well known that writing Time Machine backups to storage is throttled to slow them down. What’s the point of using faster SSDs that are more expensive if macOS stops them from being fast
Can you promote threads set to run on E cores so they run on P cores instead? Can you demote threads set to run on cores so they run in the background on E cores?
Why does compressing a 15 GB file within a sparse bundle run more slowly than would be expected from its write performance?
Why data compression is everyday, and how its performance problems can generalise into tasks of similar structure.
The Eclectic Light Company 