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Absurdly long Sierra download time.

I didn’t start downloading Sierra yesterday until after I got home from work here in the Central Time Zone, figuring the manic rush straining the Apple servers would be over after 5-6 hours.

How wrong I was.

I launched the download and was initially thrilled to see it would take less thatn 30 minutes. But no. After about 25% of the download, I was informed the time necessary for the download had risen to 5-6 hours, and over the next hour, the time required rose steadily to peak at, no joke, “one day, 11 hours.”

So I called my ISP, and after rebooting my computer, my router and my modem, I ran Speedtest (see below).

https://www.speedtest.net/my-result/5649708170

I then relaunched the download, and within minutes, the estimated total download time again rocketed from under 30 minutes to well over a day.

I have a life, so I abandoned the download overnight, with the hope, again, that the rush would be significantly reduced by the time I tried again this morning.

Ha! As I write this, the estimated download time now stands at “two days.”

I’m glad Apple is having success these days (I remember the dark days of the mid-’90s), but c’mon — this is nuts!!

What gives?

Thank you all for your ideas and suggestions. I tried virtually all of your suggestions (except using a new DNS #), and none of them made a measurable difference.

But ... what did work was the simplest alternative: I waited and launched the download this morning, and it was up and running within 40 minutes.

Sooooooo ... patience was a virtue in this case.

it's a popular download, it's a large download, it's free download but just as importantly it's a TCP/IP download so it needs to do a checksum for all the data sent. This is not like a UDP stream for Netflix or XBL HD movies where the data does not need to be verified so there is much more involved. Your ISP can be the fastest thing out there but it's still  limited to the bandwidth Apple is limited to when something this large and with all these factors and anticipated goes live.

I know its a really big file, but I think something is wrong on Apple's end. I downloaded Sierra yesterday afternoon on a 2010 MacBook, during what should have been prime time for the download, in about 35 minutes. Now, using the same router and on a much faster iMac, it is stuck at an estimated time of 1 day and 13 hours, and the estimated time keeps getting longer.

According to Fast.com, my iMac is currently downloading in Safari at 65 MBPS. So it is definitely not a problem on my end.

Jimmy, I appreciate your knowledgeable reply, at the same time I'm very well aware that Sierra is "popular," "large" and "free." You're writing over my head with your references to UDP and XBL.

I posted because I have never before seen such long download times for the Mac OS. I'm not in a flaming hurry to get Sierra, but a public warning/reminder of the possible lengthy download times before release of the next iteration of the OS might be a very good thing.

P.S. I just checked, and the projected download completion for me is 1 day 6 hours away.

I'm still struggling with the same thing.  I've made it to 2.32 GB by doing a variety of things including switching WiFi networks and doing quite a few pauses and resumes.

Funny thing is I've had the same problem with OS X before.  My El Capitan had a similar but not quite the same issues where I could only ever get to around 1 GB of the download done before it almost stopped entirely.  I had to download the installer at someone else's house on their Mac.

I agree and appreciate the info about why this download could struggle but how come none of that information is advertised or explained by Apple?

I have the same issue and I'm downloading it at my university which fast.com is telling me i have 250 Mbps and speedtest.net tells me 235! First half told me 10 min then i got to about 2.3 gb and it tanked to currently 13 hours. I agree that this is absurd even for a popular free download especially when I have heard of people downloading it in an hour or less.

Mine's been saying 10 hours for the past hour or so.

Considering pausing it and trying to just resume it overnight.

I would just like to add my 2 cents to this thread.  I have two Macs (one iMac 5K and a MacBook Pro).  The software downloaded and installed without any issue on the laptop, however the iMac stalls out around 1.07 GB each time and I receive an error message that the downloaded cannot be completed.   

And my 2 cents, Late 2012 iMac. Download in about 40 minutes today around 10:30 AM EDT. This over a Wifi connection. Luck of the draw??

If it helps anyone, after a pause and resume of the download, my download speed of Sierra increased significantly. 

You know pausing and resuming the download helps often when I am updating apps but has not helped this time.   However when I checked at lunch it was still chugging along at 2.77 GB and that was after 6 hours.  Hopefully when I get home it will be close to done.  #remindsmeofdialupinternet

Problem started last night... got bored of waiting so i show down my machine and trying again today... not sure if my cable company is throttling speeds because so many people are probably downloading at the same time such a large file... any word from apple regarding this situation?

UDP and TCP/IP are ways which data is transferred over a network and/or the internet

User Datagram Protocol (UDP) is used for streaming files, if you watch a normal or High Def (HD) video on your "device" e.g. laptop, Apple TV, Roku Box, Xbox Live (XBL)  that a file that is several gigabytes in size. The video streams down from a server, if it runs into a problem it keeps going, it does not need to stop and check anything unless it times out and you pause watching that video or drop connection. It may also drop the HD for SD if it assumes it's going too slow which is 4x less each time you lower the resolution by half so it can send less data and still provide you with a video, albeit a crappy looking one. This how streaming services deliver data. It's is far faster than the alternative:

Transfer Connection Protocol/Internet Protocol (TCP/IP) when you transfer data from files on the internet that needs to verify there is something called a checksum, break it down it's two words "check sum", the data needs to be verified that the correct data was sent, each time small packet of data is received your network card (or wi-fi card) measures the outcome and if the data is incorrect it asks for it to be sent again, depending on this and other factors (network traffic asking the server to resend data because the wrong checksum happened from computers all over the world) this can slow distribution down from a centralized location or multiple locations. If the checksum was applied at the end of the download and failed then the entire download would need to begin again, this method checks smaller "packets" of data so if that packet fails just resend the packet until it passes correctly. It can not send "less data" like UDP, it sends as much data as the file is on the other end. If it runs into any problem it asks the server to resend the data, you and tens of thousands of others are doing this when you download OS X 10.12 at the same time. While this method is far slower it is exact and has to be to the best of it's ability, otherwise the chance of getting a corrupted download is significantly higher and back in line you need to go and start the download all over.

See if this helps

OS X El Capitan download TOO SLOW

UPDATE: Stopped the download after 3 hours, restarted computer. Got through 3.08GB/4.77GB of update- then stopped and said "calculating." Waited, waited, nothing.

I'll wait a week. Not into it.

最後更新：2017-09-26 13:47:22

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