System and IINA version:

• macOS 12.0.1
• IINA 1.2.0 Build 129

Expected behavior:

IINA follows the best practices in the Energy Efficiency Guide for Mac Apps. In the case at hand:

Ensure your app is absolutely idle when not in use

Actual behavior:

IINA continues to consume a small amount of CPU when a video window is paused and minimized to the dock. This capture was done on a M1 MacBook Pro with one local video file paused and the window minimized to the dock::

low-batt@gag ~$ while true; do ps -c -o 'comm,%cpu,cputime' -u low-batt | grep IINA | grep -v grep; sleep 5; done
IINA               0.5   0:01.10
IINA               0.6   0:01.14
IINA               0.6   0:01.18

CPU use increases with the number of IINA windows opened and paused. In this case there were 3 windows paused and minimized in the dock:

low-batt@gag ~$ while true; do ps -c -o 'comm,%cpu,cputime' -u low-batt | grep IINA | grep -v grep; sleep 5; done
IINA               1.2   0:04.13
IINA               1.1   0:04.22
IINA               1.1   0:04.30

Steps to reproduce:

Open several local video files in IINA, pause them, minimize the windows to the dock, use Activity Monitor or ps to confirm IINA is still consuming CPU time.

• MPV does not have this problem.

MPV also has this problem, but MPV is not causing the IINA issue.
I already have tracked down what is consuming CPU.
I will shortly post a pull request with proposed changes to address this issue.

How often does this happen?

Every time.