Software tower · floor

How to fix slow boot Mac with one held Shift key

How to fix slow boot Mac has a first step that almost nothing else mentions, and it is not a change — it is a measurement. Apple documents a way to start the machine once with its startup list switched off.

Apple’s heading: “Temporarily prevent items from opening automatically when you log in”
  • “If you see the login window, press and hold the Shift key while you click the Log In button, then release the Shift key when the Dock opens.”
  • “If you don’t see the login window, restart your Mac, press and hold the Shift key when you see the progress bar in the startup window, then release the Shift key after the desktop appears.”

That is the whole test, and it costs one restart. Start the Mac once with its login items suppressed and see whether it is different. If it is, the answer is in that list and you can go and edit it. If it is not, you have ruled out the usual first suspect — which is worth more than another guess, because it stops you deleting things that were never the problem.

Everything else on this page depends on what that restart tells you, which is the right order and an unusual one. The common advice is to go and empty the login list on the assumption that it is the culprit. The list is easy to empty and hard to reassemble, and if it was not the cause you have spent an afternoon and lost the things you wanted opening for you.

What Apple does not say

Apple’s page on a slow Mac lists five causes — disk space, memory, an incompatible app, apps left open, and a disk problem — and login items are not among them. Nowhere does Apple write that a long login list makes a Mac slow to start.

That absence is why this page is built around a test rather than an instruction. The claim that login items slow your startup is extremely plausible and is not published by the manufacturer, so the honest move is to hand you the measurement Apple does publish and let your own machine answer. One Shift-held restart settles it for your Mac, which is the only Mac the question was about.

If the Shift-held start was noticeably quicker, the list is where to go — and there are actually two lists in that pane, which is worth knowing before you start switching things off.

Login items

things that open

“Apps, documents, folders, or server connections” that open automatically whenever you log in. Visible things — windows appearing that you did not ask for.

Allow in the background

things that run

A separate switch letting an app “perform tasks when the app isn’t open, such as checking for software updates or syncing data”. Nothing appears on screen.

The distinction matters because they fail differently. A login item announces itself: a window opens, an icon appears in the Dock, something is visibly running that you did not ask for. A background item is silent by design — Apple’s own examples are checking for software updates and syncing data — so a machine with nothing visibly open can still have a queue of things doing work.

Where the list lives

The pane has been renamed, which is why older instructions send you somewhere that no longer exists.

  1. Apple menu → System Settings, then click General in the sidebar.
  2. Click Login Items & Extensions. “You may need to scroll down.”
  3. To stop something opening: “Select the name of the item you want to prevent from opening automatically, then click below the list.”
  4. To add one: click below the list, choose “a document, folder, app, server, or other item”, then click Add.

One note on the name, because it is a common source of dead instructions. The pane is now Login Items & Extensions, inside System Settings under General. Guides that send you to System Preferences, or to Users & Groups, or to a tab called simply Login Items, are describing an arrangement that has moved.

And if the Shift-held start made no difference at all, the startup is not what is slow — the machine is, and it happens to be most noticeable at the beginning. That is a different question with a different published answer, and it has its own floor below.

What this page will not do is give you a list of items that are safe to remove. Which apps should open at login is a question about your day rather than about macOS, and a stranger guessing at it would be guessing at the wrong thing.

It also will not tell you to reset anything, clear anything, or install a startup manager. Apple documents the list, the switch, and the test; everything past that would be somebody else’s theory printed in the same typeface as the facts.

Where to start

Three ways in. Take the first one before you change anything.

“I want to know if it is the startup list.”
Hold Shift once — the test
“The test made a difference.”
Two lists, not one — the two lists
“It made no difference at all.”
Then it is not the startup — when it is not that

The test

One restart with Shift held, and the answer is yours rather than an article’s. Apple publishes both routes — from the login window and from a restart.

Restarting a MacBookOne menu item and one checkbox — and the power button does two other things entirely.Open this floor → Is the Mac actually chargingAmber means two opposite things, USB-C has no light at all, and the menu has four answers.Open this floor → Force quitting on a MacThree routes, and the one that works when the screen has stopped responding.Open this floor →

The two lists

Things that open, and things that run without opening. Same settings pane, different failure modes, and only one of them is visible.

Deleting apps on a MacTwo different routes, and the one that leaves things behind.Open this floor → Clearing a cache on a MacTwo separate commands — and neither is described by Apple in terms of speed.Open this floor → Updating SafariWhy there is no separate Safari update, and where the version actually comes from.Open this floor →

When it is not that

If the test changes nothing, the slowness is not in the startup. Apple publishes five causes for a slow Mac and none of them is a login list.

Speeding up a MacBookApple publishes five causes, and not one of them is a cache to clear.Open this floor → Checking a drive’s healthThe command every guide names has been deprecated — and Microsoft names the replacement.Open this floor → Why a computer is slowThe same question on any machine, in the order the causes actually occur.Open this floor →

What this tower will not do

It will not list which login items are safe to remove. What should open when you sit down is a question about your work, not about macOS.

It will not tell you that login items are the cause. Apple does not say so, and the whole point of the test above is that your machine can answer it better than any page can.

And it will not recommend a startup manager or a cleaner. The list is a settings pane with an add button and a remove button, and there is nothing there to manage on your behalf. What holds instead is simple: the two routes for temporarily preventing items from opening at login by holding the Shift key, the location of the Login Items & Extensions pane inside System Settings under General, the add and remove instructions, the description of login items as apps, documents, folders or server connections that open automatically, the separate setting allowing apps to perform tasks when not open such as checking for software updates or syncing data, and the five published causes of a slow Mac are quoted from Apple’s documentation listed below.

Where this page got its facts

  1. Apple, Open items automatically when you log in on Mac — Mac User Guide (that Login Items & Extensions settings choose which items open automatically at login; that apps, documents, folders or server connections can be set to open automatically; the route through Apple menu, System Settings, General and Login Items & Extensions, with the note that scrolling may be needed; the instructions to add an item by clicking below the list, selecting a document, folder, app, server or other item and clicking Add, and to remove one by selecting its name and clicking below the list; the separate setting to allow apps to run in the background and perform tasks when the app is not open, such as checking for software updates or syncing data; and, under the heading “Temporarily prevent items from opening automatically when you log in”, the instruction to press and hold the Shift key while clicking the Log In button and release it when the Dock opens, or, where no login window appears, to restart the Mac, hold the Shift key when the progress bar appears in the startup window and release it after the desktop appears) — support.apple.com, read 22 August 2026.
  2. Apple, If your Mac runs slowly — Mac User Guide (the five listed causes of a slow Mac: a startup disk without enough free space, an app requiring more memory than the Mac has easily available, an app that is not compatible with the Mac, apps that are not being used and should be quit, and problems with the disk to be checked with Disk Utility — a list in which login items do not appear) — support.apple.com, read 22 August 2026.

Written by Alberto Gulotta

Founder and editor of AI Tools Primer, writing from Palermo, Italy. Thirty-five years of taking computers apart, starting with a Commodore 64 — the long version is on the about page.

Something wrong on this page? Write to aitoolsprimer@gmail.com and it gets fixed.

Written on 22 August 2026.

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