How to speed up a Mac: Restart the machineThis sounds like an obvious suggestion, but many people will leave their office machine switched on for days or even weeks on end - it isn't them paying the electricity bill. Even Macs used in the home can be left switched on for a ridiculously long time, particularly when they're being used for all the family to get online, watch on-demand TV and movies, enjoy online gaming, get done some homework and so on. Give your Mac a break: give it a restart and let it wake up fresh. Also see: All Mac reviews.
How to speed up a Mac: Shutdown unused appsAn older Mac might struggle if you try to do too much at once. Right-click any Dock icons for apps you aren't using and choose Quit. Alternatively, switch through your open apps using Command-Tab, then hit Command-Q to close whatever is the currently selected app. Also see: OS X Mavericks review.
How to speed up a Mac: Activity MonitorUse the Activity Monitor (in the Utilities folder) to keep track of any running processes. Check the % CPU column for any that are using a large amount of resources, but ensure you know exactly what the process is for before you quit the process.
How to speed up a Mac: Reduce startup itemsOne of the things we're often told to do to speed up a Windows PC is to reduce the number of startup items. The same is true for a Mac. You'll find the option to prevent the apps you don't need launching at startup in System Preferences, Users & Groups, Login items.
How to speed up a Mac: Delete stuff you don't needA hard drive that is bursting at the seams with vast amounts of data is not a happy hard drive. Delete any files and applications you don't need (be sure to empty the Trash for a start), and move what you can on to an external hard drive. To uninstall a program you simply drag its icon from the Applications folder to the Trash.
How to speed up a Mac: Install an SSDFitting an SSD to a Mac isn't the easiest job in the world, depending on your model of Mac, but it is possible. SSDs are much faster than HDDs in accessing data, plus they run cooler and quieter. However, pound-for-pound an SSD can store much less data than can a hard drive, so it may be worth using your hard drive as a back up drive. Note that write speeds can be faster with larger-capacity SSDs, although read speeds are unaffected by the drive's capacity.
How to speed up a Mac: Install more RAMIf a RAM upgrade is possible, our testing has revealed that larger amounts of RAM can make a huge difference in speeding intensive applications, but for more general day-to-day tasks the difference is less pronounced - in some cases, having too much RAM can actually slow some processes. Around 8GB of memory is a happy compromise for most users.
How to speed up a Mac: Install a faster graphics cardThe other hardware change you might consider is to install a faster graphics card than that which came supplied with your Mac. However, unless you enjoy gaming or creative pursuits such as photo- and videdo editing, this could be an expensive upgrade in comparison to the speed boost you get in return.
How to speed up a Mac: Keep it up to dateBy keeping the Mac OS X up to date you will ensure any patches and bug fixes, as well as OS enhancements, are applied. Click the Apple menu and choose Software Update. You can also check for software updates within any apps you've installed. Lastly, open System Preferences, App Store and tick the box for 'Automatically check for updates'.
How to speed up a Mac: Clear the browser cacheIt's worth resetting whichever browser you use on the Mac to keep it clear of temporary files and other browsing data. In Safari, for example, you simply choose Safari, Reset Safari.
How to speed up a Mac: Turn off visual effectsIf your Mac is struggling with some of Mavericks' graphics, open System Preferences, Dock and experiment with turning off Magnification, Animate opening applications, Automatically hide and show the Dock, and turn off accessibility. Lastly, change Genie Effect to Scale Effect under 'Minimize windows using'.
How to speed up your Mac: Is it really your Mac that's slow?Just because something you're attempting to do on the Mac is taking forever to complete, it doesn't necessarily mean it's the Mac that's to blame. Be sure to consider what you're doing whenever you notice it slowing down. Are you trying to get on a website and it's taking forever? Maybe the website is having problems, or your internet connection is slow, or you need to upgrade your router.
Source : pcadvisor