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My base 2012 11" MBA 4GB 1.7i5 is holding up very well. Only lag I have noticed is when using Feedback Assistant, but that could be because its generating a file in the background. Runs just like Mavericks for me. Very pleased.
 
Feels slower than Mavericks on my 2010 MBA, which is a bummer since Mavericks felt WAY better than ML did.

Guess it's gonna be my last year with the old thing *sigh* Four years out of a $1000 laptop ain't too bad!
 
Running pretty similarly to Mavericks on my 2010 MBP (8gigs RAM)... except I've noticed that video in Safari is SUPER choppy now. Watching 1080p trailers from Apple in Safari gets me 2 or 3 fps. I can watch the same trailer in Chrome and it's completely smooth, so there's clearly some issue with Safari I guess.

Edit: Looks like it happens with 1080p content in iTunes too...
 
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It's beta software. It's not finished yet.

Ask us when it's launched...

While it is true that it's beta software and still has a bunch of debug code and parts of code that isn't optimized yet, I don't see any technical reason why Yosemite's performance over Mavericks would be better.

Mavericks did bring a few features like Time Coalescing and Memory Compression that brought us more performance. Yosemite doesn't feature anything like that. Thus, Yosemite's performance will be equal to or worse than Mavericks. The use of translucency everywhere makes me think the latter.
 
runs great on my 2007 iMac. if you don't have an ssd you should probably stop at snow leopard. everything after that NEEDS an ssd. it's 2014 for god sakes, 256 SSD costs 100 euros in here. it's more than enough
 
2014 MBA 13" 4gb 128ssd

smooth as silk, no slowdowns whatsoever
battery life slightly reduced, more dramatically when multitasking (compared to Mavericks)
 
Using MBA 2011 1,7.. Yosemite made it slow-working, slow-reaction, it's sad.
I'm downgrading it back. Any way, Yosemite is helpful for me just because of the continuity, while I don't have iOS 8, it's useless for me!
What about the interface - it is very much beautiful, nothing bad or negative to say about!
Hope I'll ever upgrade my mac to RMBP!

Runs like a dream on my 2011 1.7ghz 4gb ram MBA. Feels as fast if not faster then Mavericks.
 
Safari seems snappier and the overall OS seems very Swift....

But really you can't base performance of an OS when its in beta, there are way too many things going on in the background to compare i.e. debugging, non responsive scripts, bugs...

A fair comparison will be after the actual launch.
 
I am willing to bet most peoples problems are they are running software not compatible with Yosemite yet.
So when running slow it isn't Apples fault.
 
On my 13" rMBP, it's hell of a lot slower, with animations and transparency being very choppy and slow.

Are you sure you are on beta 4? I installed from my developer code two days ago but I had to run through 3 updates in the App Store before it was fully upgraded. So the initial download was beta 1 even though I downloaded it 48 hours ago. I was a bit concerned when I started using it because it was super crappy for beta 4 (Opening menus had a visible delay, mission control felt like it was 10 FPS, web pages wouldn't load in Safari...), but now that I am updated it feels quite normal.

This is on a 2012 13" rMBP as well.
 
Late 2010 27" iMac 16GB memory. Runs really well. The old page-load delay in Saffari is gone so Safari is really quick. Everything else is as fast or faster than Mavericks. If they achieve any more improvement with optimizing before final release it will be awesome.

Also, this is a beta release. it's called that because Apple wants to find and squash bugs. Installing it and complaining makes no sense.
 
2011 base model 13" MBA. Love the performance so far for a beta. Not as fast or as seamless as Mavericks just yet - Safari in particular is a little slow, especially when it's trying to intelligently predict your searches and give you instant results - but battery life is comparable to Mavericks for me and I've had only one program crash on me (FaceTime).
 
I have a 2012 15" non-retina MacBook Pro with 4GB RAM and a 750GB 7200RPM HDD and 10.10 has been running great! Things seem to be responding faster than 10.9.4. Hopefully this trend continues with 10.10GM. I get the occasional Hangup but that's to be expected with beta software.

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How long does the indexing take?
Depends. 30 minutes to an hour, if that.
 
2009 macbook (white unibody) 2.26 with 4g mem...

clean install using terminal method (sudo /Applications/Install\ OS\ X\ Yosemite\ Beta.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite\ Beta.app --nointeraction)

I find it runs a tad bit faster then mavericks and overall pretty snappy.
 
Macbook Air mid 2012 13" works just great and the beat of that is that airdrop works with yosemite and my iphone 5 with ios 7.1.2!Apple great work!
 
Depends. 30 minutes to an hour, if that.

Cool man, thanks. As far as performance goes, at first everything was laggy due to the indexing I guess, but now it feels like 10.9.4 again, which is great. I do feel that Safari is a bit faster now though :)
 
It's just a Beta, lot's of bugs and of course not the final release.
Why compare it with a "stable" system??

I got a rMBP 13" 256ssd 8gb, I wait to put Yosemite.

Instead, I installed Ubuntu 14.04 as a dual-boot. It works great!!
 
While it is true that it's beta software and still has a bunch of debug code and parts of code that isn't optimized yet, I don't see any technical reason why Yosemite's performance over Mavericks would be better.

Mavericks did bring a few features like Time Coalescing and Memory Compression that brought us more performance. Yosemite doesn't feature anything like that. Thus, Yosemite's performance will be equal to or worse than Mavericks. The use of translucency everywhere makes me think the latter.

When did they pull Memory Compression?
 
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