I have a wireless network set up at home via Time Capsule. I also have Time Machine installed on two laptops and they backup to the Time Capsule. I have noticed that whenever a backup is running the wireless connection speed drops from 30Mbps to around 8Mbps or less. Is this normal and is there a way to minimise such drops?

  • 3
    Any WiFi has a bandwidth. That is the maximum data throughput. So if you have 2 or 3 devices using full data stream (back up) the connection speed will slow down.
    – Ruskes
    Aug 29, 2014 at 20:36
  • How can I throttle the bandwidth used by backup procedures?
    – urok93
    Sep 3, 2014 at 13:13

2 Answers 2


Any WiFi has a bandwidth.

That is the maximum amount of data it can handle.

For example the 5 GHz WiFi can handle up to 8x more data then the 2.5 GHz.

Setting (limiting) a bandwidth usage for a specific application is not easy and Mac does not offer a build in solution, but there might be some external applications for that.

Here are some suggestions how to do that.

However, one can also use the AirPort Utility (in your utility folder) to set the Date/Times for Time Capsule. Set it to Times when you are not using the computer to prevent overcrowding your WiFi network.


I had the same problem (and even disappearing network). I found reports that the Airport Extreme and Time Capsule devices don't handle mixed IPv4/6 environments very well. Switching off one (in my case, the latter), was said to address the problem.

After I switched it off, sadly and oddly, my problems disappeared.

  • Can the down voter please clarify why the down vote? I would like to make sure I address the concern and improve on the answer. Apr 23, 2016 at 17:42
  • This improved my home network packet loss significantly. Even with an ISP that supports IPv6, disabling it on my Time Capsule made my internet much more stable when performing daily backups.
    – jlev
    Oct 9, 2018 at 17:22

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .