Q: Why is Remote Management and screen sharing now very slow between two MacBook Pros running Yosemite?

I tried the free "Chicken" a VNC client and got much better connection speed, performance, and stability.  So that's a workaround until Apple fixes this.  I still prefer Apple's built in Screen Sharing app. when it's running correctly, as in the previous OS versions.

Same problems here. Screensharing between Yosemitee machines is extremely slow. Hey apple, your Yosemite release seems a big failure. The list of bugs is endless...everything seems to be controlled more and more by marketing pressure than by high quality standards.

Yup - same here.  Mavericks machines all behave just fine here, but after upgrading my Macbook Air to Yosemite, Screen Sharing takes *minutes* to connect.  Really hope this gets fixed soon!

I have the same problem. It's faster for me to use UltraVNC Viewer from a Virtualbox PC on my mac to connect to another Mac, than it is to use the built in Screensharing in Yosemite.

Just updated to OS 10.10.2 and there is no difference.  Still takes at least 30-60 seconds to connect over the internet.  LAN connections are instantaneous.  Bummer.

Is anyone still having this issue? Ever since I updated to Yosemite...screen sharing between my MacPro & Mac mini (both 10.10.2) lags big time. I use my Mini for email, screen share onto my 2nd monitor connected to my MacPro, a setup I've used for 4 years...never an issue until Yosemite. connected an old macbook running 10.6.8, and it connected to my mini just fine, no lag, no hiccups...I'm also no experiencing temp freezes in 10.10.2...NOT a good update...

No, the problem has not been fixed for me.  Really annoying.  Plus some other non-related issues (mainly with Mail) that were supposed to be fixed with this update.  Guess we'll have to wait for 10.10.3…..

My problem is very similar.

I share screens by connecting my 2012 Macbook Pro with OS X 10.9.5 to my 2014 Macbook Pro with Yosemite. The 2014 Macbook Pro with Yosemite gets extremely slow after 1 hour of screen sharing. It gets even worse when the 2014 Macbook pro with Yosemite has failed in performance and force quit application more than a couple of times. If I don't share screens, the 2014 Macbook pro with Yosemite works solid. I really want to figure out how to fix this problem. I rely on screen sharing for live performances and the laptop is not allowed to fail.

Any help on this would be much appreciated.

Cheers

After 10 - 15 minutes the connection becomes very slow and unusable for me. I have a Macbook Pro 2014 and Mac Mini 2013 so the hardware isn't limiting the connection and it was working fine before Yosemite. I'm glad I'm not alone suffering a slow connection.

Screen Sharing using my 17" MBP running Yosemite to 2104 Mac Mini is not a problem, with no lag whatsoever, using my 15" rMBP (mid 2014) to do the same is very laggy.

Is it Yosemite or something else?

I have a few clues to the lag issue (I think).

If I am logged into my retina Macbook pro, and try to screenshare at the full retina resolution, I get slow frame-rates. I used this app: Retina DisplayMenu v0.2 (DropBox), http://www.reddit.com/r/apple/comments/vi9yf/set_your_retina_macbook_pros_resolu tion_to/ which allows me to adjust the actual resolution of the macbook with pixel accuracy.

Once I bring it down to the native resolution of the display I want to share the screen on, I get much better performance. The other thing I have observed is that if I screenshare from my IOS device, while I am already sharing via the screensharing app in Yosemite, the performance is totally destroyed. I have to reboot the macbook, and sometimes even the other mac I am running to share the screen, before I can get things back to normal performance.

Hope this is useful info. Still waiting for a fix though...

Add me also to the list.  What's weird in my instance is that everything worked fine until Yosemite 10.10.2  and since everything is painfully slow even on a local network.

To everyone who replies here:

There are two different issues here at work, apparently:

1. A long delay before Screen Sharing connects.
2. Bad performance once Screen Sharing is connected.

I am experiencing only #1, not #2.

By some trial-and-error with several Macs, running both 10.9 and 10.10 systems, I've figured several things out:

• The delayed connection occurs with the client (the connecting computer) running 10.10, even if the targeted computer runs 10.9.
• One computer I connect to has two separate internet connections. I can connect through one instantaneously whereas the other has the delay (or causes a timeout).
• The issue occurs with a D-Link (DIR-652) router but not with a Fritz!Box router.

I also found a way to make the bad connection (through the D-Link router) work: Enabling the "DMZ" option in the router solves the issue, i.e. I can connect without delay. (DMZ means that all traffic gets routed to one computer in the network, effectively disabling the firewall.)

This last part requires more research. Here's what I've done so far:

Officially, Screen Sharing only requires TCP port 5900 to be forwarded by a router from the internet to the particular computer that you want to control (see TCP and UDP ports used by Apple software products  - Apple Support). I tried forwarding ports 22, 111, 443, 3031, 3283, 5900 and 5988, both TCP and UDP - to no avail. Yet, enabling DMZ brings back the undelayed connection every time. Changing several other Firewall settings in the DIR-652 didn't help, either. I also checked on the connecting computer which ports were open during a connection, and in every case it appears that only 5900 on TCP was used - but that was during the sharing, not during initiation of the connection (i.e. it could be that other ports come into play during the initial handshake for opening the connection). Disabling IPv6 on both ends didn't help, either.

I guess the next step would be to log the IP traffic during the time of opening the connection to see what's happening, and why it works thru one router but not the other. I am not eager to do that, though, as it's a pain to do with the tools I know of (i.e. Wireshark).

Had the same problem, worked fine before I updated the remote machine to Yosemite. I could connect ok, but it was very slow.

Anyway, I turned scaling off and now it works a lot better. In View > turn scaling off.

I'm getting both #1 and #2 when I connect from my 2011 17" MBP running SnowLeopard to our 2008 MacPro running Yosemite. I do not get either when I connect to our MacMini that is running MountainLion. Our network is all Gigabit ethernet through a Netgear gigabit switch. The MacPro had been running SnowLeopard and we had no problems with ScreenSharing. Once I upgraded the MacPro to Yosemite (had to run software on the big iron that required MacOS 10.10) we got delays in connecting (30 seconds not unusual) and once connected the remote pointer lagged behind the local one by a few seconds. Also, once I started scrolling a window it would just keep going. Made it a pain to select a file or use any website.

Remoting from the Yosemite MacPro to either the SnowLeopard MBP or MountainLion MacMini does not have the connection or lag problems.

I will try Chicken of the VNC on the MBP and see if our problem lies in the interaction between SnowLeopard's and Yosemite's ScreenSharing.