The update brings a large number of minor changes that are important to all users
Apple has now released the 10.9.3 upgrade for OS X after nine pre-release betas. This is also one of the first that was seeded to everyday users as a part of their new program.
According to Apple Balla, the first major upgrade that is coming is the support for Retina displays on 15 inch MacBooks. This still won’t be available for 13 inch models since their Thunderbolt Port can’s support it, but this will in fact be a large upgrade for users that it is possible for.
Security upgrades are also coming in this, due in part to the breach that was discovered in iCloud. iCloud was exposed as having a security flaw recently, causing a lot of controversy, but they say that they have it under control at this point. Staying one step ahead of security problems is something that Apple has always focused on, making this important.
Performance wise, there is also an upgrade for VRAM, bumping support up to 1536MB in total, while some of the older models will only be upgraded to 1024MB. In either case, this can help with the support for 4k displays that comes along with the update.
The update is available now and Apple is encouraging all Mac users to make the update. Check it out in the App Store where it is available for free.