May I have to upgrade to 10.10?

[mikezang]

I am still using a 2010 later Mac mini with Mavericks, I want to know if I can upgrade it to Yosemite without speed problem?

I asked same question before I upagraded to Mavericks because I am afraid of speed, I got answer "You should do it without problems"! I felt the speed is getting slow after upgraded.

 

[Partron22]

I've a 2011 mini that I took from Mavericks to Yosemite. Reducing transparency effects and cutting down on superfluous cloud notifications made the machine feel as fast as it had been under Mavericks.
I've probably forgotten a thing or two, but there are plenty of speed hint threads here for Yosemite on older Macs.

 

[mikezang]

I've a 2011 mini that I took from Mavericks to Yosemite. Reducing transparency effects and cutting down on superfluous cloud notifications made the machine feel as fast as it had been under Mavericks.
I've probably forgotten a thing or two, but there are plenty of speed hint threads here for Yosemite on older Macs.

I got a mistake, my mac mini is 2009 late, it is very old. but if I don't upgraded it, I can't share note between iOS9 and my Mac mini...

 

[Partron22]

My reply generally still holds. Reduce transparency, and minimize all the various cloud services, and you should still have a reasonably useable machine. Likely not quick to boot, but once it's up, you should be fine.