Q: boot very slow after installed Yosemite

thanks a lot!

Thanks rssg.  My 2 month old 2014 Apple Air running Yosemite for no apparent reason to me went from booting in 15 to 20 seconds to a full 45 seconds.  After following your suggestion, Disk Utilities, Verify Disk (it was ok) I restarted while holding OPT CMD P and R.  I held it inadvertently longer than maybe I needed to since I heard 2 gongs before releasing.  Tried rebooting twice after this procedure and bingo.  Up and running in 15 seconds flat.  Nice

Thank you Synergy!  This fixed mine too - great job...thanks so much!

I had this issue too with a early 2011 Macbook Pro core i7. It took me a while but I just resolved the issue for myself. I had the same issues as everyone else, after upgrading it took 30-40 minutes to boot, every app lagged, even online lagged. I tested everything and everything checked out, even the hard drive passed the dsk utility verify and repair, so after racking my brain a minute I rebooted into recovery mode and ran verify/repair on all drives listed the top one failed to verify a filing system. This didn't seem to bothersome though because formatting should fix that. But it didn't still slow, so I took an old Harddrive out of a windows Laptop I was no longer using and formatted it, I created a OSX boot usb drive (google how) and cleaned installed OSX  10.10 on the older HDD. Once cleaned installed on THAT HDD it worked like a charm. Don't let the Genius tards tell you your 2011 Macbook Pro is super slow because its older. ITs everything to do with the HDD it self. If you clean install on a new HDD or SSD it will boot fast. I got a late 2008 core 2 duo booting in 30 seconds, so IT is not because the 2011 machine is to old LOL......Where do they get these guys from....

Mine is very slow also, particularly in the User Environment Setup (grey apple screen with progress bar at the bottom).

I also have had issues during operation, however I think I have partially solved this by disabling iMessages and Facetime on the Mac as it was getting really annoying all my devices going off!

PRAM reset worked for me.  I also reset permissions but that had no effect.  After PRAM reset however, my boot times went from well over a minute down to about 25 seconds, which is satisfactory to me.  This is on a late 2008 Macbook with a Samsung 830 SSD.

Actually, Yosemite runs much smoother after the reset as well.  Could be that replacing the battery was a factor.  Ours went completely out before we just replaced it.  We added the new SSD at the same time.

Hi guys

I am new with Mac and I have a MacBook Pro 13in with CPU i7-2.9 and 8 GB of RAM.

It was working very well with Mavericks but since I upgraded it to Yosemite, It became very slow. It takes 2+ min after entering my password in loading bar and It makes me really disappointed about MAC.

I have tried many solution such as

1- repaire disk permissions

2- rest PRAM

3- rest printers

4- unplug printer

and so on...

But non of the worked.

I accidentally found this which we have turned on filevault during installing Yosemite. And when I disable it every thing get back to normal. Now it running on 5 sec. For disable filevault you write the following text in the terminal.

sudo fdesetup disable

It takes 7 hours to be completed but you can do your job during its progress.

Please, get a backup of your important data or information.

I hope this work for you too,

And sorry my English is not really good.

I have an older 2011 Mac mini with a pretty fast Hybrid Toshiba drive & 16gb ram. Mountain Lion booted in about 25 seconds.

I then did an upgrade to Yosemite (not a clean install) & boot time was horrible at 1 min & 25 seconds.

I then researched & found out about resetting the PRAM. Now Yoesmite booted up in just 32 seconds & now I'm happy again!

Here's the link:OS X Yosemite: Reset your computer’s PRAM

Extremely easy to do & takes no time at all. Once I reset the PRAM, I then restarted & timed the boot up. Very pleased now & will be keeping Yosemite vs going back to Mountain Lion.

Thank you, Synergy, had been having this problem for a long time and the printer tip really did it!

Hi guys, how long does it take for your old mac to RE-boot?

I've just checked mine and it takes 1min 15sec for a reboot from when I click restart button inside the OS.

I'm using

MacBook Pro (15-inch, Mid 2009)

2.8 GHz Intel Core 2 Duo

8 GB 1067 MHz DDR3

NVIDIA GeForce 9400M 256 MB

Samsung SSD 840 Pro 256MB

Yosemite

It's fast overall, only the boot and reboot times are long.

Yep, definitely a HDD issue in my case where it was taking ages on the initial Apple screen with the progress bar and also generally after boot-up.  I swapped out the HDD and replaced it with a Samsung SSD 850 EVO and is now running great!  I'm now using the old HDD as a spare external drive.

Well, all the programs I've tested are saying that the disk is OK. Strange.

Just did a PRAM reset and a fresh boot for me is 27 seconds, while reboot is 40 seconds. Still better than before.

Thinking about resetting SMC as well.

Hi,

just found out an usb or empty sdcard adapter could delay boot by 30 seconds for an unknow reason ^^,

on a 2011 mackbook pro after removing the empty sdcard adapter boot is now 18sec when it was 50+ with the adapter ..

Reset PRAM works for me!

Thanks

hello everyone! I had this same problem. All i had to do was reset the PRAM.

1. Here's how to reset your PRAM:
   1. Shut down your machine. Yes, all the way down, not sleep or logging out.
   2. Press the power button and then press command-option-p-r. ...
   3. Hold those keys down until your Mac reboots again and you here the startup chime.
   4. Let go of the keys and let your Mac reboot normally.