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I have used a variety of software configurations for linux: Arch, Fedora, XFCE, KDE. And in all of these systems, I notice that computer performance is slow, and applications respond sluggishly when I am copying large files. Why is this? I do not notice this in Windows. Thanks!
Oh I copy from the local hard drive from /dev/sda5 to /dev/sda6. CPU usage is about 15% on 2 cores, I have i5. It's not really a specific copy. This is all copy, while the copy is going. Like in KDE using dolphin. Or thunar in XFCE.
Note that you have lots of processes running there and every little thing needs memory, I would disable things that are not in constant use, every lil bit helps if you do a lot of copy and if you really need it.
KDE does drain a lot RAM. Have you thought about add more RAM or switch to a lightweight WM?
Other things to consider, processor and memory are not really the things that make a computer fast, the BUS come 1st, because everything have to travel through it, the slow side is the storage devices in comparison to the BUS like hard drives, CDROM, USB sticks etc, how fast is your hard drive? Are you copying from one hard drive to another, or is it USB to HD or USB to USB ? Think about !
Perhaps the cpu is being bogged down with io wait. I mean some programs respond sometimes, and some freeze for a while. It's interesting the difference between that and windows, when the whole computer freezes in windows as opposed to just some processes freezing. Idk though, I have 4 GB RAM and a 5200 RPM hdd... so my hardware is not the issue. I'm just wondering if anyone else also experiences system lag during a large file copy (> 1 minute).