The MacStats Blog
Thoughts, updates, and deep dives into macOS internals. We translate complex system metrics into plain English.
What Is nsurlsessiond and Why Is It Using My Wi-Fi?
Learn what the nsurlsessiond process does on a Mac, why it uses so much network bandwidth, and how to stop it from draining your data.
Mac Memory Pressure Explained
Confused by the memory graphs in Activity Monitor? Learn exactly how Mac Memory Pressure works and when you actually need more RAM.
Best Mac Monitoring Apps in 2026
Compare the best system monitoring apps for macOS. See how MacStats, Activity Monitor, iStat Menus, and Stats stack up against each other.
The Best Menu Bar Apps For Mac
Discover the most useful and beautifully designed menu bar apps to boost your macOS productivity, organization, and system monitoring.
Mac Fan Running Constantly? Here is How to Fix It
Learn why your Mac fans ramp up and how to use Activity Monitor to find the specific app causing the noise.
Why Is My Mac Overheating?
Is your Mac hot to the touch? Learn about thermal throttling, CPU spikes, background tasks, and how to cool down your machine.
How To Check Memory Usage On Mac
Learn how to monitor your Mac RAM usage using Activity Monitor, understand Memory Pressure, and identify apps causing memory leaks.
What Is WindowServer and Why Is It Using So Much CPU?
Learn what the macOS WindowServer process does, why it consumes so much CPU and RAM, and how external monitors affect its performance.
What Is mds_stores and Why Is It Using CPU?
Learn what the mds_stores process does in macOS, why it causes loud fans and high CPU usage, and how to fix Spotlight indexing issues.