10.8 caused internet connection to slow to crawl

Its clear that

1. This is a BIG issue with 10.7/ 10.8 and *probably* MBP 2011 13"....17"

2. Im pretty sure Cupertino are aware of this (its a long thread, Lion should be a priority etc) whether they're ever going to address/fix it is another matter

I'm having the same issue but I can find a way to reproduce this issue. (I have MBP 2011 17" Lion 10.7.4, 8gigs RAM yadda)

When the processor fan is blasting away merrily copying 40-60 gigs over firewire my speed drops to a crawl or worse. Safari, Firefox, Dropbox replication in the background, EVERYTHING is dead on the network.

When the copying comes to an end the processor chills out, and the connections (eg dropbox, firefox etc) all come back to life.

My guess? If there is a combined pathway for the NIC and the processor bus (or shared drivers or processes) Im guessing the bus/ traffic loading is causing either a IO controller or IO controller driver conflict or log-jam. Its too much a co-incidence that the internet traffic leaps when the firewire 800 stops. I can repeat the behaviour. Weird.

Anyone else explored this? Clearly for now we're on our own.

Same issues here.

2009 iMac and internet is slow after I installed Mountain Lion; I've also noticed wifi signal going off from time to time. My wifi hotspot is an Airport Express on 7.6.1 (latest).

Apple, please fix this!

I have the same problem on both a Macbook Pro and iMac (both bought in 2011). To make it more fun, it is intermittant!

Tried all the hints that are on the forums, with no solution that fixed it. If you play around with location and lease renwal, it may fix it for while. Changing to a different encryption did not fix it.

Looks like we will need a patch from Apple to solve this. I hope they are working on it, as it is very frustrating.

I am having the exact same issue. When I use ethernet via the thunderbolt adpator, the speed is fantastic. With Wifi, it is very slow. Turning WiFi off and on helps, but eventulaly it slows down again.

Prior to Mountain Lion, this was not an issue.

13 in MacBook Air Mid 2012

1.8 GHz i5

4 GB Ram

The suggestions at this link have seemed to resolove the problem for me, however, I am only about 30 minutes into using this setup.

http://osxdaily.com/2012/08/02/fix-o...tion-problems/

Samething here with both my imac 2011 and MacbookPro 2011.The problem is intermitent, I have no clue on how to fix it.

I have ta add this : the slow wifi speed is only with inernet. when i acces my nas on the same wifi network, i go full speed.

The suggestions at this link have solved my problem. I am not sure why, but the have.

http://osxdaily.com/2012/08/02/fix-o...tion-problems/

After several days of problems I followed the info found on this link:

http://osxdaily.com/2012/08/02/fix-os-x-mountain-lion-wireless-connection-proble ms/

Here is the proceedure:

1. Start terminal
2. cd Library/LaunchAgents
3. mkdir Back
4. mv *.plist Back
5. cd /Library/LaunchAgents
6. sudo mkdir Back
7. sudo mv *.plist Back
8. cd ../LaunchDaemons
9. sudo mkdir Back
10. sudo mv *.plist Back
11. Restart Computer (TopLeft Corner Apple than Restart)

WiFi should work normaly.

By removin all of the plists and letting ML add them back in, my problems all went away. Have been running at full speed not for several days without a glitch. NOTE: the files are only moved, so you can move them back if required.

Caution: If you run Parrallel software, I had to re-install the software which only takes minutes.

I made these changes via the terminal and it definetely helped my wifi issues.

However, changing the MTU via the instructions at this link singificantly improves my connection speed. My dowload speed is 20 time fast and my upload speed is 10 times faster according to speedtest.net.

http://osxdaily.com/2012/08/02/fix-o...tion-problems/

This fix worked for me. Actually, I didn't change the MTU, just created a new location, renewed my DHCP lease, and did a system reboot for good measure. So far, so good!

http://osxdaily.com/2012/08/02/fix-o...tion-problems/

The osxdaily.com fix has certaily helped, but I still have intermittent connection issues.

In searching the forums this morning, I saw a refrence to bluetooth interference as perhaps the cause of some of these wifi connection issues.

Here is a link to a site the discusses this: http://forums.whirlpool.net.au/forum-replies.cfm?t=1965579

Low and behold, when I turn of my bluethoot trackpad, my connection speed issues immediately resolve. Time will tell if this is a permanent fix.

Obviously it is not ideal for me to run without bluetooth, as at work I run my Air with an external monitor.

I hope this might help some.

Hey all....

So I had a similar issue; very strange - my partner has MS Windows 8, and I have a MacBook Pro - anyway, whenever I started or 'woke up' my Mac, my partners laptop would seriously lag online; and my Pro would do the same - every page taking 30 seconds to a minute to load at best.

I trawled forums and found one suggestion to turn off Photo Stream in System Preferences > iCloud...

This fixed it.... instantly! The difference is amazing with download etc as now each page is loaded in a second or two at most, on both laptops - can even stream different videos on each without issue - before, you had to wait for one to fully download as you could not stream anything!

Just a suggestion if anyone has photostream running as I tried every fix i could find; this only happened after latest update though which is weird?

Here's my incredibly simple solution. Plugged my airport express into a wall socket instead of a power strip. Voila! It may not be what others are experiencing but that's what worked for me. Give it a try!