I upgraded my MacBook Air early 2014 to El Capitan from Yosemite. I'm encountering random lags , especially while app switching.
Is downgrading to OS X Mavericks possible ? (My MBA came preinstalled with Mavericks)
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If your Mac originally came with OS X Mavericks installed and you do not have a separate USB Installer for OS X Mavericks or never downloaded a complete OS X Mavericks Installer from the App Store, from which you can create a USB OS X Mavericks Installer, then you'd have to wipe the HDD/SSD so the Recovery HD was not there and then start the Mac using OS X Internet Recovery (Command-R). Without the aforementioned USB Installer then OS X Internet Recovery is the only way to get what originally shipped on your Mac back.
Note: If in the past you had downloaded the full Installer for OS X Mavericks from the App Store but no longer have it you can still download it again from the App Store under Purchased and then create a USB Installer from it.
Be sure you are properly backed up before proceeding to reinstall, by whatever means.
Downgrading isn't possible, only erasing and starting from scratch.
You can always make a backup of your data, then manually restore it to your MacBook after you install Mavericks. I'd recommend just an external HD to copy all of your home folders (Desktop, Music, Documents, etc.); then when you finish setting up Mavericks, just copy the data back.