Comment 257 for bug 197762

>i had similar issues but also when i was trying to copy a file(around 50-700mb or larger) from my
>local hdd to another folder of the same hdd!!!
>so what i found out was that this was happening only in files that i had downloaded with "transmission"!

What file system were you using on your hdd, and what version of Ubuntu are you using?

This isn't surprising, because bittorrent downloads tend to write the file in random order (depending on what is made available from the bt seeders and the bt peers) and in multiple threads. Using ext4 and a relatively modern kernel, it won't be too bad, because ext4 has better allocation algorithms than ext3. It's best though, if the bt client uses fallocate(), which is I'll bet what qbittorrent is doing.

So this is a useful bit of information, but I suspect some users have different causes for their problems, which is one of the reasons why most kernel developers have refused to use Launchpad. Too many ubuntu users are glomming onto a bug report, and they post different performance problems all in a single bug report, without bothering to give full information about their hardware, software versions, what file system they are using, etc. And then on top of that Launchpad is slow as a dog when there it gets too long.

Which is why this bug is marked invalid and why I beg people, if they have performance problems, to open new bugs and to give full details about their hardware configuration, what version of Ubuntu they are running, the exact specifics of the USB device, etc. Otherwise this can be a great place for people to vent, but most people who aren't paid to pay attention to dysfunctional bug forums will simply say, "Beam me up Scotty, there's no intelligent life here".