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Hmm, very strange. Maybe the Mac mini really needs 8GB for Yosemite then. Would love to get more a general consensus on 4GB users feelings vs 8GB users feelings. So far 8GB users seem to not notice much if any UI slowdown.

Forgive me if this has already been suggested, but have you thought about trying the 10.10.1 beta? You can subscribe to the OS X Beta Program to try it out. Perhaps see if there is any performance improvement after you've installed the beta. Only try it out if you have nothing important on the computer you install it on. You won't be able to downgrade afterwards.
 
My Experience

I have been using the mac Mini early 2009 with 8gb RAM and 128GB Crucial M4 so far application access time is very snappy but...safari has jittery animations when opening and mission control is 20% choppy.
 
Overall performance was better with 8gb over 4gb but animations and the UI still seem slow. Finder in particular. Mavericks is noticeably faster, I think that I'll be sticking with that until Apple fixes these issues, if at all... BTW i am running a 2ghz model with Nvidia, 8 gb ddr3, 128 gb ssd.
 
new SSD

Just put a new SSD in my Mac Mini (3,1) 2009.
2 Ghz. 8GB memory.
10.8.5 OS (So I can sync my Palm Treo 680)

xbench v 1.3 = 163.03
geekbench 3 single core score 1106 multi core score 1882
NovaBench 360
 
Yosemite runs terrible on my early 2009 mac mini (4GB)
I am going to research going back to Mavericks which ran very well.

My attached firewire drives always gets dropped, and the computer never locks up but whenever I power down and it always shows me a status bar like it is downloading something. I would say it is very unstable.

Mavericks never did this.

I am debating upgrading to the current top tier Mac Mini with 2TB FD, 8GB RAM as I use this is a music server and don't like to hook up my monitor to see what the problem is. I figure a new model is probably a lot more stable.
 
Any more input on the performance of this Mac mini with Yosemite? I still haven't jumped ship, but was wondering if 10.10.3/10.10.4 improved things in terms of UI lag.

Cheers.
 
Any more input on the performance of this Mac mini with Yosemite? I still haven't jumped ship, but was wondering if 10.10.3/10.10.4 improved things in terms of UI lag.

Cheers.

I bought a Late 2009 2.53GHz / 8GB ram / 500GB 5400rpm the other day on eBay. Should be here early next week and I will report then.
 
Any more input on the performance of this Mac mini with Yosemite? I still haven't jumped ship, but was wondering if 10.10.3/10.10.4 improved things in terms of UI lag.

Cheers.

I have 10.10.4 on my 2009 Mini with SSD and 8GB and the frame rate is not good. I've been using the Mini for years as a HTPC and I thought it was slowly on it's way out until I read this thread. Can't play ripped DVDs without stutter.
 
Any more input on the performance of this Mac mini with Yosemite? I still haven't jumped ship, but was wondering if 10.10.3/10.10.4 improved things in terms of UI lag.

Cheers.

I bought a Late 2009 2.53GHz / 8GB ram / 500GB 5400rpm the other day on eBay. Should be here early next week and I will report then.

As a follow up to my own post...I am very happy with the machine. I use it as a file server and occasionally for some very basic use and I see no problems. I can imagine with a SSD it would fly. OSX El Capitan betas on Core 2 Duos are very promising so far as well...
 
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