HELP! MASSIVE LAG after Update.


macrumors newbie
Original poster
Oct 18, 2014
Dear all,

I have experienced a massive lag / non-responsive ui after updated to Yosemite. :(:(:(

I'm using a Late 2013, Macbook Pro Retina 15" , Intel i7 2Ghz, Iris Pro, 8 GB 1600 MHz DDR3.

Here are the list of obvious lags:
  1. System preferences - When open, will need to wait at least 5-10seconds
  2. Safari, all website loads very slow .. and non responsive. Most of the time it shows a white screen, and wait for almost 10seconds to load
  3. Anything on the menu/title bar, the spinning wheel will appear
  4. Everything much slower than before

I have tried

1. Reduce transparency
2. PRAM Reset
3. Reinstall Yosemite
4. Repair Disk

But all fails and the problems still persist.

Any great guru can help here? Thank you!


macrumors member
Sep 9, 2009
May be obvious - have you checked Activity Monitor for rogue processes? Spotlight may be indexing everything and causing your issues. Did you enable Filevault? That could be another culprit - Chrome especially was super laggy until Filevault encryption was complete.


macrumors 65816
Sep 13, 2014
Philadelphia, PA USA
After my first full day on 10.10, YES. Worked a lot with Adobe today (Photoshop/Illustrator) and that is painfully dragging. I've boosted the RAM/Scratch Disc settings and no change.

Trying to bring up the menu for saving images (Control+Click) - that menu pop up is lagging, or it won't come up at all. Dragging an image from an external HD to desktop to edit, sluggish. Opening images in preview I get the dreaded spinning rainbow wheel for a few seconds...then the image appears in Preview. Just feels like the entire computer is struggling.

It is a 2011 Quad Core 3.4GHz, I installed more RAM about 2 years ago (12GB total), No idea, maybe a clean install can help.

Another oddity is my volume setting, it's just louder than before. Before I had the Volume bar at 4,5. Wasn't blasting music and other sounds.

Right now I am literally at 1 volume bar and it's fine. Not a huge is running on speakers with it's own volume control - I never changed it, like I said, just odd.

On the Bright side, I actually gained space back on my HDD after installing 10.10. Roughly 900MB! Suppose Yosemite dumped a lot of old large sized unneeded Mavericks files(?)

**** PaintTheSkyGrey - I will check the Activity Monitor. Spotlight was indexing like crazy yesterday. I WAS on Chome and noticed a massive RAM drain using it, I'm on Safari now.