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Learn more from this MacObserver article on how to get started. To fix them, you’ll have to delete them first and create new up-to-date preference files. They are usually stored in the ~/Library/Preferences folder.
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How to fix: find and update those broken preferences files
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If they are broken due to application crashes or hard drive corruption, your Mac will start up and run slowly. rules that define how applications behave. The preferences files on a Mac are those files that keep the parameters - i.e. Fortunately, you can do so with CleanMyMac (open the app > Maintenance > Repair Disk Permissions)
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For Macs with El Capitan or later versions including latest Catalina, unfortunately Apple has taken away the disk repair functionality. Learn the detailed step-by-step instructions from this Apple support guide. If your MacBook runs macOS Big Sur or an older version, use the build-in Disk Utility. How to fix: verify and repair disk permissions MacOS system files are usually saved on a hard disk - primarily “Macintosh HD”.ĭisk errors can occur due to poorly designed third-party applications/add-ons, and when those errors add up your Mac startup can slow down, even worse, unable to boot up. Last but not least, transferring big files to your external hard drive would help lighten your Mac too. Clear the web caches, history, and outdated extensions. Don’t forget the web browsers - Safari, Chrome, and Firefox. Then go to the “Applications” folder, sort apps based on last modified or used, remove those you no longer use. If you prefer to do this manually, start with checking those folders where you tend to save your pictures and movies. Try Gemini 2 to find those duplicates and delete them.
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Meanwhile, if your MacBook Pro is filled with copies of backups and pictures, chances are you’ve got many duplicates or similar files. It can save you tons of time locating those unused third-party programs, junk junks, and large old files that are safe for removal. The easiest way to get this done is to use a cleaning app such as CleanMyMac.
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How to fix: clean up your MacBook hard drive until it has at least 20% free space. You’ll notice your Mac lags not only on startup, but during normal usage as well. Nothing slows down a MacBook Pro more than having an almost full disk, even if your Mac is with a high-performance SSD. By the way, some auto-startup services may not show up on Login Items, but you can find and disable them via Launch Agents within CleanMyMac. You can also do so by using CleanMyMac, via the “Login Items” and “Launch Agents” features. Here you’ll see a list of apps that run when you turn on your Mac. Check the apps you don’t need, select the checkbox in the “Hide” column, then click the “-” icon.See the Login Items tab next to Password? Click it.Click the Apple logo on the top left corner, then select System Preferences.How to fix: remove unnecessary Login Items. applications and services that automatically launch every time you press the start button on your Mac). The same goes with a MacBook Pro. Your Mac will take longer to fully boot up if it has dozens of login items and launch agents (i.e. Like a car, it can be much slower to take off to 60 MPH if you’ve got loads of heavy items in the trunk. If your MacBook Pro (with SSD) still runs slowly on startup, consider enabling TRIM and the whole process takes only a minute or so. Once completed, your Mac’s overall performance would improve automatically. The process could take a significant amount of time to complete, and lots of system resources are required for the task.
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For example, Spotlight has to scan the internal hard drive and reindex all the files, likewise, Photos (formerly iPhoto) may update the while photos library as well. Why this helps: apps like Spotlight and Photos usually need quite some time to re-index data.
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If that still doesn’t help, you may need to enable TRIM (more below). How to fix: keep your Mac on for 24-48 hours, and restart several times after that. This is normal because some apps (especially Spotlight, and Photos) need to re-index or update its data. If you just updated your MacBook Pro to latest macOS Catalina ( learn how if you haven’t done so), you probably have noticed that your Mac takes longer to fully load up and respond to general tasks.