Q: Safari running slow in Yosemite

Palio--when you say you did "everything described above," what are you referring to having done? There are many different suggestions in this thread, some of which did not work for everyone. Please be more specific. Thanks.

Sorry: The steps I was referring to were as follows:

From your Safari menu bar click Safari > Preferences then select the Privacy tab.

Click:   Remove All Website Data

Then delete the cache.

Open a Finder window. From the Finder menu bar click Go > Go to Folder

Type or copy paste the following

~/Library/Caches/com.apple.Safari/Cache.db

Click Go then move the Cache.db file to the Trash.

Quit and relaunch Safari to test.

If that doesn't help, troubleshoot Safari extensions.

From the Safari menu bar click Safari > Preferences then select the Extensions tab. Turn that OFF, quit and relaunch Safari to test.

If that helped, turn one extension on then quit and relaunch Safari to test until you find the incompatible extension then click uninstall.

This did not resolve the issue.

As suggested by others, resetting Safari and clearing any related files does not resolve the issue permanenetly, only for a short period of time.

Putting a mac to sleep seams like one way to reproduce the slowliness. At least by my observation.

Reboot however helps, but only for a limited time.

There was a known issue of degraded OpenGL performance in the past on some mac models after wake from sleep.

I tested the OpenGL performance with CineBench before and after sleep but there's no difference.

However if I disable javascript in Safari, the slowliness is gone > at a cost of videos not being displayed (and therefore cant be started) on websites.

So it seams like there's a degraded performance of executing javascript within Safari that's the issue.

I don't know how to solve this, but perhaps other more experienced users could have a few thought / ideas regarding this.

I also have this slow loading in safari. But not always. I've tested the wifi 2.4GHz or 5GHz, but happens on both.

But, connected by wire / ethernet, I don't see the issues.

Is there a wifi issue ?

I'm sure it is not my router. I have windows PC's using the same router and also my /this mac was working fine before. Also the iPhone and iPad doesn't have an issues in laoding pages on safari.

it's not a wifi issue, I'm on cable and any other browser on my mac runs flowlessly except Safari.

Take a bow, or should I say curtsey, Ms. Samit: I tried two [Open & Google] DNS changes to no avail. In the end my slow Safari was being cased by an extension or extensions.

The only extension I left running is 1Password and it appears to be compatible ... I 86ed all the others and, Presto!, Safari back to normal speed.

Amateur solution based on experiment!

I have Yosemite on a 2012 iMac and Safari is the glacier to Chromes rabbit.

I was looking at the drop down menus and came across  DEVELOP/USER AGENT/SAFARI 7.1.3

Speed of opening pages is what I would expect with the addition that Safari, latest version, has all its functionality.

Apparently it appears to web sites as IE, but appears to you as Safari - did a bit of reading up on User Agent.

Quitting Safari shoves it back to the "Default" but two clicks later and Develop/User Agent/Safari7.1.3 has it humming along.

Tried the cache.db delete in Finder and nothing obvious changes. Develop/Empty cache has a small affect but Chrome still better.

The above works a treat for me.

Any comments welcome.

Hope it help someone else till Apple get Safari working as it should - voooom!

I just read your post, Steve. .. DLed Chrome and, yup ... Fast as a bullet.

What a shame Apple's native browser is so slow whilst another browser offers a great Internet experience.

I, for one, am grateful you shared your experience with Chrome.

Ron Hughes wrote:

 

The combination of the part-solution given in the 1st post on this thread, plus your additional info about closing down Safari, Restarting the computer, then emptying Trash seems to have speeded-up my experience. Whether it lasts, is another matter ....

 

But thanks

Yes, this also appears to be working for me - I've only just done it though. I was trying to stream high quality music and it was impossible but has been playing perfectly now for 20 mins or so, so at least at first this seems to be working.

A bit late, but I had the same problem. Safari used multiple gigs of ram. After deleting the website data it was ok for a couple of hours but the problem returned fast.

On another forum I found someone who mentioned Adblock as the problem. I deleted Adblock and the prob was gone. Now I use Ublock which doesn't use much Ram/Cpu

Just followed these directions and things are starting to look better. Not yet as fast as Safari has responded in the past. The other user on this account likes to park everything on the desktop. Will a cluttered desktop slow down Yosemite?

Thx Bro, it did really helpful

I fixed the problem by using this method

Hi,

After trawling all of these "fixes" for laggy Safari (and graphics in general on Yosemite) for my 2014 MBPR, I accidentally discovered the real fix, for me at least.

I have FileVault 2 on, usually, always have. I decided to disable it (and have it decrypt the SSD), just for sh!ts 'n' giggles.

Safari is now instantaneous, just like Chrome, and graphics around the system are generally snappier than with FV2 enabled.

I now have created a disk image (dmg) which is encrypted separately, so anything personal can be kept in that, and I'm not too fussed the whole system isn't encrypted now, as it's far more responsive, even on a system as fast as this.

So try disabling FV2, you can always enable it again afterwards if it doesn't fix it for you, but the difference for me is remarkable, and is definitely thee fix for my laggy Safari.

I'd been going crazy constantly quitting and restarting Safari, trying all sorts of tricks to get this stalling and lagging...forever sometimes!...to stop. Your suggestion seems to have fixed the problem like a miracle, although I did leave one Smart Search setting checked for now, as it doesn't seem to cause problems and might make things faster; it's Enable Quick Website Search. I will uncheck it if I run into problems again. Thank you for finding this search fix and sharing it, Scott, really...I was hating my computer lately. Now it's back!!