Should I disable every unfamiliar startup item?
No. Identify its owner and purpose. It may provide sync, security, updates, licensing, or device support.
Does disabling a startup item uninstall its app?
No. It changes supported automatic startup behavior.
Why did a startup item return?
Its owning app or updater may recreate a required helper.
Is high used memory bad?
Not by itself. macOS uses memory for cache. Look for sustained pressure and symptoms.
Why did available memory decrease again?
macOS and applications reused memory for active work and cache.
Do visual settings make the Mac faster?
They can change perceived animation and responsiveness but do not upgrade CPU, memory, or storage.
Why is administrator authorization requested?
A selected protected startup or system-setting action may require it. Approve only a matching request.