The first update to Apple’s newest Mac operating system is available. I’ve installed it and all went smoothly. This should take care of the initial bugs, or most of them anyway, so if you’ve been waiting to try Yosemite, I think it’s time to move up from Mavericks.
If your new system seems sluggish for a while, the computer is indexing all of the files on your hard drive in the background. Once the indexing is complete and the new, improved Spotlight Search feature knows where all your stuff is, you speed should return (or even improve). The indexing can go on for many hours, depending on the size of your hard drive and how much stuff you have stored.
Here’s a link to slides telling about Yosemite features.