Certain effects, especially for later OS X installments, can take up a bit too much processing power for their own good, especially when downloaded onto Macs with lesser capabilities. If you want to speed up Macbook Pro or older iMacs, head on over to the Accessibility section in System Preferences. Go to Accessibility and make sure that in the Display section, you select the option to “Reduce Transparency.” This ability, available in the Yosemite update, can help open and close apps more quickly.
Also, try these:
To disable animation effects:
Apple Menu > System Preferences > Dock
Select Scale Effect from the drop-down menu.
Un-check Animate opening applications and Magnification.
To disable widgets:
Apple menu > System Preferences > Extensions
Click Today.
Uncheck the widgets you can live without.
4. Upgrade, Upgrade, Upgrade
We’re talking primarily about software upgrades here. While it is theoretically possible to upgrade many Mac devices, the process is a little annoying and expensive: If interested check to see if you qualify. An easier and less expensive method is to simply upgrade all your apps and your operating system. Apple has a typical routine: The more patches the company releases for software, the better it gets at improving performance and giving you speed boosts.
This is most noticeable when it comes to OS X upgrades, so make sure you have the latest version of OS X that your Mac can handle. But don’t let your app updates languish in the App Store, either. Upgrade everything you can, reboot, and see if you notice the difference. You may be surprised.
However…
If you’re having trouble with digital hoarding, and you find that you legitimately can’t save much space by cleaning up your Mac to free it from unused programs, large files or duplicates, then it might be time to upgrade your hardware. If you’re looking for the best bang for your buck in terms of dollars to value added, an internal upgrade or a separate external drive to store large files such as photos, videos, and music should do the trick. If you really want a significant performance upgrade, and you’re not worried about the cost, an SSD (solid state drive) upgrade is easily the option that will provide the most noticeable gains in system performance.
While you’re at it, you should grab some additional RAM so that resource intensive programs aren’t bogging your machine down. Additional hard drive space, and doubling (or more) the RAM in your Mac will offer instant performance gains.
5. Manage Your Startup Items