Download Starts Fast Then Slows Down

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Leida Haury

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Jan 20, 2024, 11:40:02 AM1/20/24

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Hey all. so i picked up a used 840 evo and noticed that its write speeds are not what i thought they would be. i already know about the 840 evo read issues. i have already updated the firmware and also run advanced optimization.

when i copy files from my other ssd (512gb crucial mx100 ssd) speeds start out fast around 480-495 mbps then it almost halved to 279mbps and stays there. if i copy the same files from my 960 evo 240gb nvme drive to the MX100 its locked rock solid at 485mbps writing.

I understand these are different drives but still, why is my 840 evo dropping write speeds while my mx100 is not? is it a drive issue or could it be the ssd controller is getting to hot some hot and its throttling speeds? i noticed that when copying a large file my mx100 to my nvme 960 evo that it did the same thing as the 840 but much worse. it speeds were at 510mbps then dropped to 120mbps crystal disk info was showing the drive temp hitting 44C for the 960 evo nvme. don't think that's very hot for a drive?.

here is a picture of the copy from the mx100 to the 840 evo.

I tried with my Samsung 840 evo, transferring 5GB, 10GB, and 20GB files from a 970 evo. The transfer would start out at around 490MB/s and then for the larger files eventually it would jump down to around 420MB/s before finishing. It was a pretty sharp drop off, going from 490MB/s to 420MB/s pretty much instantly once it reached a certain point in the transfer.

download starts fast then slows down

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idk what's going on with the huge spike at the start, transfer initially starts out showing 1500MB/s for about a second or two then goes down to 490MB/s, stays there for a while, then drops down to 420MB/s about half way through the transfer.
Cache? SLC write buffer? Windows not knowing how to calculate things? \_(ツ)_/

After some research, on a source it says, it something that relates to copy buffer. At the start copy buffer is empty, so the copy speed is quite fast.. but later.. it slow down as the copy buffer is full.. but that source does not says anything about how to clear/empty the buffer :(

What you're observing is the buffer filling up initially with high speed. This data isn't written to disk yet, because disk is slower than the buffer and can't keep up. The OS is simultaneously flushing the buffer to disk and buffering more data to be written, but buffer has fixed size, so buffering slows down to the speed at which OS can free up buffer space by flushing. At this point you're observing disk's real write speed (possibly bottlenecked). Finally, everything is buffered and the progress window disappears, but OS actually keeps flushing the buffer in background until it's empty.

When you send multiple files to the destination disk (external disk) it has to write multiple files and each file's blocks (internal split up of a file on disk) will be scattered across disk and written and disk has to spin for each file block back and forth causing a delay in writing the data. If it had been a single file and if you had contiguous memory space in the disk (if lucky) then this would be really fast. Even if you don't have contiguous memory location, handling a single file and spinning only to store that file will be the sole work of the disk (theoretically) - Your disk's RPM is the factor here.

I tried transferring a (single) big file again. This time the speed jumped up to around 480MB/sec, but just for a short moment, then it declined down to around 30MB/sec again. I think the speed realistically should be somewhere around 150MB/sec since that is the read/write speed of the hard drive.I am using it in USB 3.0 ports on my computer.

I read in another post that the slowing down part could be because the indexing of the copied files fill up some sort of transfer buffer. But that was about a usb flash drive. If that is the case however, what is the point of having fast connections and devices? I would be really greatfull for any help I can get. Thank you!

Can anyone help me please.
I have just started having problems with my hot water flow. When i turn the tap on to run a bath it starts off running at normal speed but after about 2 minutes the flow reduces to just above a trickle and if i try to run another hot tap at this point i dont get any water out the other hot tap. If i turn the tap off for a couple off minutes and then back on it starts off ok again and then slows down again.
This has only started happening this week.
My hot water comes from a tank in the loft and my boiler is in the kitchen if this helps.Also my central heating is working fine.

Hope someone can help please

Chris

Uninstalling the games and restarting leads to identical behaviour every time.
The download speed starts out at maximum but then always slows down at the same place, when WoW has downloaded about 35 GB and when D3 has downloaded about 6 GB.

Hey all, I have a RBR750 Orbi WiFi 6 Router AX4200 that has a slow wifi connection for videos.
The google speed test on the router LAN connection (ethernet) shows 100/38 Mbs (great) - It is connected to a telstra fibre internet connection.
If I connect to the wifi, the speed test download starts at 80Mbs (good) then drops down to 3Mbs (bad) after 15 seconds.
I have reset the modem, updated the firmware, and still no improvement. It used to work fine. Any suggestions?

Strange thing is that it used to work just fine untill a few months ago i.e. it has always had the double Nat, and it made no difference to the speed. Something else has changed, but i'm not sure what....

The download speed starts off fine (80Mbs), then slows down to 4Mbs over a few seconds. So videos are a pain to watch, they stop & start.

I've done enough of these to know it's a common occurrence. I started migrating my wife's system to a new MacBook Air connected with USB cables. The migration starts off fine - 17mbps, half an hour later it's down to 7mbps. Anyone know why this happens? Like I said, I've done these before, the transfers alway start off fast, no matter how I am doing the transfer (last time I did mine I took out the harddrive and connected them with eSata cables) it starts off fast, then drops to really slow transfer rates.

When I hook up the Lan line directly to the computer, I get the full internet speed. However through the router it starts fast, then slows back down to half and below the speeds I am paying for. I have turned NAT and QOS on and off. I even had my ISP tech over to double check the numbers and addresses and everything on his end, but he couldnt figure it out and concluded I was getting the full net up until the router. Any help would be much appreciated.

when hooked up and working, my net will run as it should, then on the same speed tester (Ookla) it slows to about 50% of previous speeds on the second and third tests. I then switch ports to say 3 from 2, it again runs great then slows down.

Problem is when I'm seeding or downloading doesn't matter speed slows down after 5 minutes sometimes longer to few kB/s, and when I pause the download/seeding and start again that torrent it downloads fast again 5+ MB/s and same thing happend again after 5 min then I do the same trick and it start downloading/seeding again. Can someone tell me whats going on here ? I'm using latest utorrent version.

Sounds like a ISP throttle to me otherwise. Does this affect your internet Broswing if you checked email or watched Youtube video does it slow down? If no then that would be ISP throttle-they detect torrent usage and automatically throttle your internet and when you pause or stop torrent it doesn't detect it running and your internet goes back to normal speeds and if you do it again same thing happens.

I'm downloading from private tracker it has two seeding servers with 1Gbps speed plus other peoples who are seeding with them on that tracker that I'm downloading this file from. So it can't be that, becouse it's going on full for some time, and it just slows down for no reason.