
What you are looking for is an app that uses too much of CPU power or Memory. Switch between the tabs observing the processes.

Go to Finder>Applications, find Utilities folder and launch Activity Monitor located within. Luckily, you can track such applications with relative ease using built-in Activity Monitor. Such issues typically happen with third-party applications.
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Software IssuesĪpplications installed on your Macintosh computers can sometimes misbehave and consume way more resources than intended by the developer. You can use dedicated software, such as MacFly Pro, to quickly free up disk space, otherwise taken by temporary files, and optimize available memory on your Mac. You will also need to make sure your RAM is on par with your demands. Usually, it is recommended to keep approximately 15% of the total startup disk space available. In order to maintain a consistently stable performance, OS X requires a certain amount of free hard drive space and RAM to carry out operations.

Try heading to System Preferences>Security & Privacy and turning off FireVault in the respective tab. While you’re better safe than sorry, the background process of data encryption could take away from the available performance of your Mac and cause it to feel slower. FireVaultįireVault is used to secure all of your data by automatically encrypting the contents of your disk. In this case, just let Spotlight do its thing and the problem will fix itself reportedly in 24-48 hours. The process is completed automatically in the background and can significantly slow down your entire system, if you own a lower-end machine. To make that happen, however, Spotlight needs to carry out indexing first. Spotlight helps you find anything and everything on your Mac using Spotlight search.

So why have some users experienced decreased performance and sluggishness of their systems? Here are a few common reasons for OS X El Capitan running slow on your Mac. In fact, it is a better experience than the preceding OS X Yosemite in every way, provided your Mac has at least 2GB of RAM to meet minimum requirements. To be fair, OS X El Capitan was a solid release which improved stability and introduced new features. In case you have happened to experience performance issues on your Macintosh computer after upgrading to El Capitan, these tips will have you optimize Apple’s twelfth OS X release. Despite its user acclaim and positive reviewer ratings, OS X 10.11 has been reported to run slow on some Macs. And while El Capitan did deliver on all three points, everything did not go all that smoothly.
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The upgrade to OS X 10.11 El Capitan should have brought mainly stability, security and performance improvements. OS X El Capitan was released in September of 2015 and became the successor to OS X 10.10 Yosemite.
