User Cache Files
What is it?
A newly installed application may generate cache files to help it load and work faster. But after some time has passed, those cache files become outdated and the app stops using them.
Why remove it?
If you clean outdated caches on your Mac, your apps will automatically generate new and fresh cache files to help the current versions of your apps load and operate faster.
System Cache Files
What is it?
System applications generate and keep a lot of cache files. Storing too many of these files can ultimately result in longer startup times, slower Mac performance and even a Mac that doesn’t function properly.
Why remove it?
For the most part, these cache files are extra baggage. Cleaning caches on your Mac will decrease the number of outdated files you store, speed up your Mac’s startup times, and increase overall system performance.
User Log Files
What is it?
Many Mac applications have their own log files containing information on your activity. If an app crashes, your Mac can send these logs to the developer so that they can see what happened and fix the problem.
Why remove it?
Sometimes logs contain too much information, and use a fair amount of disk space. If you rarely send app crash reports, it’s fine to clean log files from your Mac to save some extra disk space.
System Log Files
What is it?
Like user logs, the activity of system applications and services is also being captured by numerous logs, which can be sent to the developer for debugging purposes if an application crashes.
Why remove it?
Sometimes, these logs contain too much information, which can slow down an app. If you rarely send app crash reports, you can clean system logs on your Mac to save space and increase app performance.
Broken Preferences
What is it?
Many apps keep preferences in special files that tell the app how to operate. Over time, these can be corrupted due to a variety of reasons: a sudden blackout, app crash, hard drive corruption and so on.
Why remove it?
Broken preferences may cause app instability or even make the app impossible to use. Removing a broken preference will change that app’s preferences to the default state, allowing you to start using it in its normal mode.
Broken Login Items
What is it?
Login Items are a list of applications and services that launch when your Mac starts up. In some cases, after an application or a service gets removed, a broken link to it remains among your Login Items.
Why remove it?
Keeping your Login Items clean from broken links will ensure your Mac won’t spend its resources on looking for non-existing apps or showing distracting error messages.
iOS Software Updates
What is it?
Every time you connect your iPhone, iPod or iPad to iTunes and update it, a copy of a software update file is downloaded to your Mac.
Why remove it?
You will probably never have use for your update files. If you do, you can re-download them from iTunes. Removing them will save you a significant amount of space on your Mac.
iOS Photo Cache
What is it?
iOS Photo Cache is a local copy of images you sync to your mobile device that makes the sync process fast and straightforward. However, this cache remains on your Mac after the process is over.
Why remove it?
This copy of synced images is only used once during the particular sync. The next time you copy photos to your device, a new portion of iOS Photo Cache will be created, which is why you can easily remove them.
Universal Binaries
What is it?
Universal Binaries were compiled both for Intel and PowerPC architectures. On your Mac, you only use one architecture code, so you may have PC code on your system that never gets executed and is taking up valuable disk space.
Why remove it?
Removing the unnecessary code from universal binaries can speed up load times for your Mac and save considerable disk space on your system.
Development Junk
What is it?
Applications usually create some supporting files on your system while they are being installed or configured. Afterwards, these files are useless and just sit there.
Why remove it?
Removing these files from your system frees up space on your Mac, which in turn can enhance your system’s overall performance.
Language Files
What is it?
Most applications are available in more than a dozen languages, and most of these language files are installed on your system with the app. Unless you want to use the app in multiple languages, these files are just wasting space.
Why remove it?
Removing language files is a great way to slim down your apps and free up a significant amount of disk space on your system.