Yosemite [erroneously] displays multiple Shared Instances under Finder

What is disconcerting though is the associated slowdown of my iMac. I do a lot of graphics design work and I'm constantly emailing clients files that are not even big ones... yet I'm seeing the spinning ball in mail... something I've never ever seen before. When I look at the Activity Monitor it says Mail is not responding but after a couple of minutes the file is attached and the ball goes away. I've been housekeeping on a regular basis, my 500 GB HDD has about 125 GB free, so its not disk space.

I'm also seeing some slowness in Finder when I'm looking for a particular image file that needs some work done to it in Adobe CS4 Photoshop or CS4 Illustrator.

Really hope Apple gets on this ASAP because having sluggish, screwed up operating systems is why I made the jump from PCs to Macs! Of course it could be that Apple doesn't really care about those of us that might be using circa 2008 iMacs trying to run the latest OS X, they may only be concerned about the systems they are selling this year. THAT... would be sad.

Mike

Update: Disappointingly, but not entirely surprisingly, the duplication issue has apparently restarted. My iMac just showed in System Preferences \ Sharing as having a (2) behind the name. :-[

I'm also getting a pop up telling me that I disconnected a 2TB USB drive which has not been disconnected. Isn't anybody at Apple bench testing these OS X releases any more? Used to be that you could count on Apple QC being decent. I just don't get it, here we have dozens of people complaining about this IP deal and a few other issues and nobody from Apple is really listening. Couple years back I filed a bug report on something... I never heard from Apple so I don't have a lot of faith in doing that again.

It's been about 12 hours and this solution seems to be working

10.10.1 fixed this for me

I Think you may be on to something. My iMac is circa 2008 and it's going berserk, but my wife's iMac is less than a year old and no problems at all. I really can't beleive how slow my mail is if there's an attached image. It can take 3-5 minutes for the ball to stop spinning. Before Yosemite I NEVER saw the spinning ball in Mail or any other App except once in a while in Adobe CS4 Photoshop when handling really huge files.

i Have a PC in my studio bc I use it to run CorelDraw and Visio... I have an older Photoshop on it, have to switch to the PC until I see an apple solution to this mess. Time is money and I can't waste time watching a spinning ball and seeing "application not responding".

MIke

I updated 2 of my iMacs to 10.10.1 but I still have the problem. I also see the problem on an older Mac running 10.7.5.

In reading through the numerous help recommendations, it looks like I need to delete a bunch of temporary files and reboot my airport time capsule, airport extreme and airport express devices.

I wish Apple would publish a help/support article (similar to what Microsoft does). It would be nice to know what name resolution protocol is causing the issue. I still can't tell if the root of the problem is a DNS, WINS or AFP. However it does seem like deleting temporary files (somewhere under ../library/systemconfiguration) and rebooting my Airport devices (which probably deletes more temporary files) is the only workaround.

I'm beginning to think that Yosemite is the new "Vista". It seems like I'm constantly debugging OS bugs and App bugs since updating. It's eating up all my free time on the weekends.

Btw, the extremely buggy Vista was the reason why I abandoned MS for Mac (I currently own 4 Macs today, 2 iPads and 5 iPhones).

I had this same issue. System Preferences > Sharing > disable Remote Management, then restart cleared it up.

Nope - none of my sharing is turned on.

Reported to Apple using their Bug Reporter (developer) in case anyone else had not reported it - I may get a reply, but then again ...

Yep, same issue. Read the whole thread (thanks Guys) and decided to jump in with two feet and investigate my matter. The key word that stood out for me was "Back to Mac". Are you guys using that? I opened up Airport Utility > Clicked on my Airport Extreme > Edit > Base Station tab at the top > Back to Mac field at the bottom. Once I removed my apple ID user, the Airport Extreme updated and when my wifi came back to my Mac's, all was well. I then turn everything back on. (Screen Sharing, File Sharing Remote login). Still good. Will continue to monitor.

Duplicate devices that were shown in finder before fix:

iMac 2008

Macbook Air 2012

Airport Extreme

Time Capsule

Thanks,

-TechOneTwo

Nope - this is not how my network is put together. Checked all TCs and Extreme (as well as the Express) and all is as basic as possible.

I made some progress (hopefully not just temporary) cleaning up bad entries by deleting my Back to My Mac iCloud ID (from my Airport Utility Tool) in my Extreme and Time-capsuled devices. In addition, i unchecked all the appropriate shared settings in system preferences / sharing.

Question, does anyone understand how Apple does name resolution in all of these tools? Are all these problems related to integration issues with Bonjour/AppleTalk protocols? In the DNS and/or WINS world it seems a lot simpler. You can delete a bad/stale entries from within the DNS or WINS tool. Although I've never had to do this. In addition, you can usually resolve name resolution issues with a simple ipconfig /renewall from the client. It's seems much more complicated / kludgy in the Mac world. Perhaps I'm missing something obvious

same problem. I have 2 macbook pros 1 year apart in age. 1 with mavericks has no problem, Yosemite does (both set up the same way on the network) I have them set up on a time capsule with DHCP Reservations (keep the same ip address) I deleted the Yosemite computer from the list (so ip will be dynamic) and restarted the time capsule. This did fix the problem, although I have no idea why. I have a feeling the reset of the time capsule made the extra ones go away so I will see if some come back and update this in the future. Hope this helps. Also I am not using back to my Mac, which again leads me to believe the reset made them go away but may not have solved the problem.

I'm also seeing a general slowdown in performance, across the board. I get the spinning beachball a lot now. Initial boot is faster, but the Finder takes forever to load. Clicking on icons doesn't do anything, it can actually make things worse (like a Microsoft PC... 😟). Apps are sluggish to start as well, and iPhoto crashes if my iPhone or iPad mini is connected when I start it up.

And yes, despite my best efforts (including deleting network .plist files), I am still getting multiple iterations of my iMac and MBP appearing on my home network. Just yesterday I had twelve iMacs showing up in the sidebar.