boot very slow after installed Yosemite

Was your printer directly plugged into your machine? Has anyone had success after turning off a network-attached printer?

My Brother HL-2170W printer is directly plugged in to my router. Could that be the culprit? My 2011 MacBook Air often freezes entirely or takes minutes (10+?) to boot up. This has been supremely frustrating, including 2 trips to the apple store and 1 fresh install. I've tried the RAM trick and the permissions tricks to no avail.

The frozen and slow boot-ups even happened after my fresh Yosemite install (courtesy of Apple Genius) and before I re-installed my printer drivers.

The only thing plugged in to my machine is an SD card.

Having same thing happening, do you thing an update will fix the ram issue's?

I have a late 2013 15in Retina Macbook Pro.

When I would turn my laptop on it would hang on a black screen for about 30 seconds before getting to the Apple logo/progress bar.

After that everything was normal.

I verified the disk in Disk Utility and needed to do a repair which was successful.

Next, I reset the SMC & rebooted. The problem persisted.

However, once I reset the PRAM (option, CMD, P, R) the issue immediately stopped.

I am back to a 10-15sec boot time.

Hope this helps.

I don't want to go back, But, I downloaded Yosemite when it first became available in the Mac App Store. How come when viewing app purchases, is Yosemite available for download and not showing as downloaded? am I running a Bata Version?

Edit

Do you have McAfee? If you have McAfee, you have to boot in safe mode (by pressing shift at boot up) and then delete McAfee. After that it should be faster.

I had the same problem and this solved it...

Hope this helps

I dont gor nay anti virus and i tried the PRAM, now starting a bit faster but there nothing to compare to mavericks.

Some one tired to revert to mavericks or install fresh OS? I mean without upgrade?

Could it be you download the update with a different user account?

Same here. The printer trick did it. I don't understand why though.

Exactly the same problem and solution here...

Running Yosemite 10.10 on MBP Retina 13" ( Mfg: late 2013)

2,8 GHz I Core 7

16 Go / 1600 MHz DDR3

Intel Iris 1536 Mo

With a Belkin Thunderbolt Express Dock ( F4U055 )

Regardless if I use it with Thunderbolt connection via TB Retina Display or directly to the TB jack on MBP.

Once disconnected, MBP boots up very fast ( although not as fast as with the original OS X Maverick version) and regardless if plug in the TB display or not.

Now looking for a solution with BELKIN... but this was not an issue with the original OS...

Hey

I have MacBook pro 15 mid 2014

It started to boot very slow after update from mavericks to yosemite. It took something like 20-25 seconds

I've disabled FireVault ecnryption and now it starts in seconds, like 5-8 seconds

Hope this helps

I have a mid 2009 MB Pro. 8GB Ram, 2.66 GHz Intel Core 2 Duo

I did a clean install and the only thing on MB Pro is the OS. No printers, no other added programs or apps.

I'm also experiencing long boot up times. File Vault is off. I repaired disk permissions which there were some needed.

Since others with newer computers are having same issues maybe it's not because of my older laptop.

Does anyone know what processes take place during the first 25% or so of the boot up status bar? Once it goes beyond that first 25%, it then goes quickly.

Seems like it has something to do with the new kext signing.

Had the same very slow startup issue on all my macs.

This worked on my 2012 mini with samsung sad:

Newest trim-enabler software -> disables kext signing and enables trim again

repair disk permissions

boots up like before, i don't even see the grey apple anymore (display lag), straight to desktop

Thank you! Clearing the PRAM worked.

I have a few Macs (Airs and Pros) at my workplace that take between a few minutes to all the way up to 10 minutes to restart. I have done a full wipe on a mac to get the same issue later on. I've reset the SMC and PRAM and still get the issue on the macs. Only things plugged in is the monitor, keyboard and ethernet cable. Some use the bluetooth keyboard and have the bluetooth mouse.

Some Macs will stop 1/4 or 1/2 way on the progress bar. After doing a few restarts it will finally past through. After that the Mac asks for the log in and then takes a few minutes to get in. Once they are in everything is fast and have no issues. A couple machines that have the issue are encrypted, while a few others are not.

I saw a lot of people talk about printers, but only have network printers setup. Haven't done anything with them, but not sure if they are the issue.

Any suggestions?