Since I don't have any free slots, I will need to replace those two modules with two 4GB modules. Sometimes, all your MacBook needs is a data clean-up. Over the years, you've probably cluttered your Mac with files and applications you no longer use or need. To get started, let's look in the Applications and Downloads folders.
If there are apps in there you can't remember installing, odds are you can live without them. Move them to the Trash to reclaim some hard-drive space. There are files associated with every application you install, however, and they are left behind when you simply move an application to the Trash. Next, let's clean up the applications you are keeping.
When you install an app on your Mac, the piece of software arrives as part of a package of files, including permissions that tell OS X which users can do what things with specific files. Over time, these permissions can get changed, resulting in your Mac lagging, freezing or crashing.
Repairing these disk permissions, in the most basic terms, amounts to reshuffling and re-dealing these permissions so that they return to their rightful place.
Read my previous post on how to repair disk permissions for a step-by-step guide. If your Mac acts like it needs a nap every afternoon, when you are at the height of multitasking, there is an easy way to see which of your open applications is using the most system resources. Open the Activity Monitor. The numbers are constantly fluctuating, but they show you the amount of CPU and memory resources each app is using. After watching the Activity Monitor for a while this morning, I see that Firefox generally takes up more CPU resources and more than triple the memory resources.
Perhaps it's time for me to abandon Firefox and use Chrome exclusively. Also, I found that the sluggish iTunes isn't nearly the resource hog I thought it was. My apologies, iTunes. Now that you've paid some attention to your applications, it's time to look at the files cluttering your drive.
You can use Finder to search for huge files. To do so, open Finder and select the volume you'd like to search. Click on the Kind pull-down menu and select Other. When the Select a search attribute window opens, check the box for File Size , uncheck any other boxes, and click OK. Change the "equals" pull-down menu option to "is greater than" and then change KB to MB.
Enter a minimum files file size such as, say, MB. You can then delete any files that show up on the list that you no longer need -- or move them to an external drive at the very least.
I outlined a safe way here that always gives you a bootable backup to check, plus it really optimizes the hard drive in the process. Also it stays optimized and faster longer when defragging software tends to require it again and again to regain the performance. If you have Filevault enabled this procedure will not work because it's one giant encrypted image, this is designed to acquire it's results by copying the parts of files into one piece again and back into a alphabetical order according to the root level directory for optimal results, especially of fast loading of Applications into memory.
First if your experiencing computer problems, backup your personal information to a storage drive first, then consult the fix it options as defragging won't necessarily solve problems in software. Data is first written on the top of the drive and works it's way down.
If your Mac is running slowly, you don't necessarily need to defrag Mac hard drive . Sometimes it's not your HDD that's having problems. If your Mac isn't running as efficiently as it used to, it probably needs to be Apple, on the other hand, has never included defragging software in macOS. One reason why a hard drive might slow down if files are particularly.
However data doesn't magically move up to take available space, holes can develop with a lot of reads and writes. Also things can get out of order, the heads have to travel further all over the drive to boot or load programs for instance. I always get twice as much boot hard drive space as I'm ever going to need, I can always partition the unused space and use it as a backup clone for on the road, or rare used items, emergency storage etc.
Unfortunately the only way to remedy this is by backing up users data off the drive to a external storage drive not TimeMachine or clone and then using Disk Utility to Erase with Zero Security option or move slider one space to the right the entire drive Erase, formatting, OS X installs on Mac's. If anyone has defragged a PC before knows it's never really completes in actuality, but this method I have here will do so wonderfully. So my solution is if your serious about performance, have large files like video that stretch across many sectors and want it in one piece, want to reduce bad sectors that can corrupt large and even small files, need to free up space for a partition or large file.
Use Activity Monitor for this and reboot to see the changes if needed. See Storage Drive here: Most commonly used backup methods. Test the clone out for some time so your positive it's solid and reliable, catch any unknown issues I haven't heard of any and alleviate any fears you may have.
It will take some time and it's a very worthwhile step as failing sectors take longer to read from than perfect ones. OnyX cleans out the caches and lets them rebuild. You will solve your Bootcamp partition formatting problem, your bad sectors problem, your defrag problems, corrupt or bloated caches and your optimization problems all in one batch.
Also have a working bootable backup in the process which is loads safer than a live defrag. Your Application's will be written to the "hot zone" the fastest part of the drive. They will load as fast as possible.