These include sending and receiving data over the network, writing and reading data to the disk, and indexing new folders or disks for Spotlight search. This process will often use a lot of your available RAM on the Memory tab, but that's much less of a worry. The amount of RAM in use will rise and fall as required.
High CPU usage, however, can bring your whole system to a grinding halt, and even result in the occasional complete system crash. In many cases, a simple restart of your Mac will clear up the problem right away. This isn't a permanent, long-term solution if you've been having this issue for a while, though. It's only a short-term fix that should provide immediate results. Whatever is causing the essential spike in CPU usage may return. So, if you've been having repeat incidents, you might want to try resetting your system management controller SMC too.
This is easy to do and can fix a wide variety of macOS issues. Instructions for resetting the SMC vary slightly depending on what model of Mac you have. Because it can fix so many issues, we have a full guide detailing how to reset your Mac's SMC. Perhaps the most obvious fix for any OS-related issues is to update to the latest version of macOS. Simply launch System Preferences , click Software Update , and run any outstanding Apple software updates. The days when Flash was essential for browsing the web, are long gone, but you may still need it for a specific web app or website.
Instead of keeping Flash installed, you can use a browser like Google Chrome, which provides Flash albeit optionally. Most likely, you don't need Flash at all, so it's safe to remove. Moreover, since Adobe hasn't supported Flash since 31 December , you won't be getting crucial security updates.
It's crucial that you remove it—at least for security reasons. Some people have had success in removing kernel extensions, which are modules of code able to perform low-level tasks. Also known as "kexts," the vast majority of these extensions are installed by Apple as part of the core macOS environment. Some software will install third-party extensions as drivers, or for controlling hardware.
To do this, restart your machine and hold the Shift key as it boots. The Apple iMac has a long line on the rear panel and mini vents at the lower bottom of the iMac screen. A application can cause the kernel task to run continusely in the background. Quit the applications that are open, use the Apple Dock to view which applications are running, the small black dot under each icon shows the application is open.
Click and hold down the mouse button or track pad in the icon in the dock to quit or force quit the application from running. Next, shut down the Apple Mac computer from the Apple menu and choose shutdown, choose the option to untick the to allow items to re open after logging back in.
How to troubleshoot the kernel task high use on a Apple iMac computer. If your Mac is on, it will turn off as you hold the keys. Keep holding all four keys for another 7 seconds, then release them. Wait a few seconds, then press the power button to turn on your Mac. Instructions for iMacs 1.
Shut down your Mac, then unplug the power cable. Wait 15 seconds, then plug the power cable back in. Wait 5 seconds, then press the power button to turn on your Mac.
NVRAM non-volatile random-access memory refers to computer memory that can hold data even when power to the memory chips has been turned off. After your Mac has shut down, wait 10 seconds.
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