Unfortunately, sooner or later all computers start to slow down. This applies to Macs as well - despite all the claims that macOS is better optimized than Windows. However, there are certain steps you can take to speed up an Apple computer that is slowing down. The most common include:
But all these tricks will have little effect if you own an old Mac with an internal HDD. The thing is that hard drives are noticeably slower than modern SSDs. This is especially noticeable with newer versions of operating systems. For example, my 2014 iMac with OS X Mavericks was very fast, but after upgrading to El Capitan or Mojave the system became incredibly slow. A clean reinstallation of macOS from scratch did not help at all, and working with the computer became resolutely impossible. Even the unfortunate TextEdit would open with a delay. And while some Photoshop was starting up, you had enough time to clean up your room.
If you’ve faced a similar issue, the most obvious solution is to move the system to an SSD. But there is one obstacle: installing an SSD in the iMac case is a tricky task because not everyone can disassemble this device by ungluing the screen. Taking the iMac to a service center is also not desirable: SSD installation is done only at unauthorized service points which are less reliable. And the price of this procedure, frankly speaking, is bitey.
But there is an alternative - to connect an external SSD to the Mac through a USB cable. However, all in all, this solution is more suitable for owners of iMac monoblocks than for owners of MacBooks.
Judging by the information provided by Apple, data transfer speeds via USB 3 and USB 3.1 first generation in iMac can be up to 5 Gbps. This is quite enough to connect an SSD drive as a system drive. In principle, the iMac also has a pair of Thunderbolt 2 connectors with a claimed speed of up to 20Gbps. But SSD adapters for them are not usually available and cost more, so we will take all the actions with a simple USB 3 port.
You will need an SSD disk, a case for it, and a USB cable. When choosing the SSD, keep in mind that you can not chase after an expensive and wildly high-speed drive: anyway, the USB port will be a bottleneck, preventing it from unleashing its potential. Therefore, it is better to save some money because even a budget SSD will still work much faster than your hard drive.
You don't need a particularly high-capacity drive either: the operating system and programs will be placed on it, and all documents, photos, and videos will be sent to the freeing HDD. So you can limit yourself to a 120 GB drive or even less. If you have an old SSD left over from an upgrade, it will do just as well. The only thing you will have to buy is a SATA to USB adapter.
Finally, you can move your home folder to the freed hard disk. This is an optional step but if you want all your documents and files to be automatically saved on the HDD, it's worth doing.
Now the system boots in 30 seconds - on the old HDD the waiting time could be 5 or even 10 minutes. All applications - and even the heavy Photoshop also start without delay. So if you don't want to take your Mac to a service or install the SSD yourself, an external drive is a great compromise.
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