MacBook Pro causes high latency on network

Hi you talk italian may be?... if yes me too... so if you need....

So, I think problem is your router compatibility channels.

do this test:

connect to cable rj45 you mac and do the ping to google.com.

If this work good, is your router....

Macbook use wirelless "N" , may be your router use it too, may be not... you need to check.

Go on router wireless configuration, put on "G" channel (so not on Auto sensing), so it use on Macbook too the "G" channel this is compatible too, so I think you solve 😉

Regards.

Some users have been seeing delays when they allow everything to go "Automatic".

No one is using IPv6 yet, so turn that off.

If you know the top speed your Ethernet port can connect at, enter it manually and it will connect faster the first time.

as TigreDARK suggests, default for you Router may be permissive 802.11b/g/n. If all devices are at least 802.11g or n, tuning off 802.11b capability on BOTH your Router and your Macs will make everything a little faster. And if all devices are 802.11n compliant, it can use the faster and less crowded frequencies exclusively.

I have had the same problem. First on 2007 MacBook and now on 2012 MacBook Pro. The resolution was the same. Turn off Wi-Fi, Turn back on = symptoms resovled. But the problem isn't resolved. I have even determined that the problem occurs every 6 hours on the exact hour of the clock in the OS. I can watch the time go from 4:59pm CDT to 5pm CDT and all other network traffic slows to hault...not just the MacBook. Then wi-fi stop/restart and everything's fine for the whole network. Then at 11pm CDT exact problem occurs.

Application check: All non-system processes are closed. Mail, Firefox, Safari, etc. not running.

Network Check: The symptoms occur whether all devices (Windows PCs, Xbox, Bluray) on the network are on or off. Mac Book, router and modem are the only common components. router using 802.11n/5G frequencies.

How can I determine how the Apple OS is hitting the network and what is causing it?

Thanks,

Buckets

how the Apple OS is hitting the network

While it is possible that Apple products are causing your troubles, it is by no means a certainty. There is a lot of equipment involved that could have timed network features.

The first is your Router. Using DHCP, your computers are each granted a "lease" on a particular local IP Address for a certain period of time. If this time is too short, your lease may terminate in too short a time, such as every six hours. You can change this parameter in your Router. A typical value is 24 hours (1440 minutes). Randomizing this value to a longer, odder value may change your symptoms. Cycling the power on your Router will randomize it to a different time-of-day.

Similarly, the IP Address lease issued FOR your Router FROM your ISP may use a similar system. Six hours is shorter than it should be, but it is entirely possible, especially if they are over-configured. When the lease expires, your Router would lose its Internet connection, and would have to request an IP Address from your ISP again. This may cause your Router's "network-visible" IP Address to change fairly often.

Thanks for a quick reply! OK so I looked at the documentation and admin portal, my Netgear WND3800 doesn't have a Lease Expiration time setting. But I can reserve an IP. So I setup a static IP for the MacBook. Let's see if that improves the situation. I realize that the router will still go through this process for the other devices creating overhead. I may try to turn DHCP off for awhile and check that too.

Omissions on my part: The symptoms are network wide, but only when the MacBook is connected. The symptoms happen for 5-10 minutes. When I intervene and turn wi-fi on/off on the MacBook, the problem is resolved for entire network. So if I were to do this after 1 minute, the problem stops. So for example, xbox is showing Netflix at HD video at 4:59pm while MacBook is on, at 5pm Netflix stops working and can not show video at all, while MacBook is on. At 5:10, I turn MacBook wifi off then on, and immediatly netflix is back to normal until 11pm.

ISP Variable

If the MacBook were powered off in the above scenario Netflix would play uniterrupted and no problem would occur. I have tried this over 10 days alternating the days I try each scenario and it's like clockwork. (no pun intended.) I'm wondering if the MacBook has a system resource that is going out over the LAN for some reason. Like a SNMP sweep or something like AppleTalk that is very active on the network....who knows.

I have the same issue with my new MacBook Pro. I have 2 windows machines and various other devices connected to my network. Whenever my MacBook connects it slow down my latency for all other PC's. I talked to apple support and they recomended speaking to my router manufacture (D-Link), after unsuccessfully trying to fix the issue.

I notice it the most when playing online games. My latency will be ~60-90 before the macbook connects and almost instantly when the Macbook connects my latency jumps to ~400. I updated the firmware on my router to the latest, updated the drivers on all my windows machines... problem still exists. I have also upgraded to Moutain Lion on my new Mac. I've disabled IPV6 on the Macbook (set it to manual), but do not know where to manually set the network speed on the Mac. I have multiple devices connecting using multiple speeds so would rather not set the speed at the router level.

This is really annoying because it cripples my gaming desktop PC whenever my wife uses her Mac - Please Help!

I wanted to let everyone know I figured out the issue... and it was a "new mac user" mistake. iPhoto was attempting to upload all my photos I imported. Once I disabled the "Automatically Import" & "Automatically Upload" options in iPhoto my latentcy returned to normal. It wasent maxing out my connection, but for some reason was causing high latency.

Hope this helps any future Mac nubs like myslef.

Did you ever resolve this problem? I'm having the same issue: network performance and latency is fine until I connect my 2009 MBP, then after some period ( a few minutes to a couple hours) latency *for the entire network* goes to 2500+. Wireshark shows a large number of malformed packets, retransmissions, and duplicate ACKs all between my MBP and outside servers. Connecting over ethernet does not have the problem. The Dell XPS laptop sitting nearby does not have the problem (the problem exists whether the Dell is there or not).

Hi All, I now this thread is too old, but if anyone could solve this problem.

I think, I just think I have the solution, almost for me.

The last weeks I was having the same problem with my Macbook Pro 2010, so I bought an external wifi card (Dlin DWA-125), it came with the drivers just for windows, but searching, I found the drivers for Mac too. Here's the link http://www.dlinkla.com/soporte?productoID=1798

After download the drivers for mac I started to use the usb wifi card without problems, but then I disconnected and started tu use the internal wifi card of the Mac and now I'm no having any problem.

I do not now what happend, lucky, coincidence, I do not know, but you don't lose anything trying this methos, just install the driver, restart, and test, may be is a solution.

Regards