Bug 470683

Summary:	Extreme speed decrease on 1GB+ files
Product:	[Frameworks and Libraries] frameworks-kio	Reporter:	Henning <boredsquirrel>
Component:	general	Assignee:	KIO Bugs <kio-bugs-null>
Status:	REPORTED ---
Severity:	major	CC:	kdelibs-bugs-null, nate
Priority:	NOR
Version First Reported In:	5.106.0
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Henning 2023-06-05 22:46:06 UTC

I am sure this bug is extremely old and known.

Just wanted to report, its still happening. 

Example: copying the 3,8GB openSuse microOS iso from btrf Fedora Kinoite LUKS encrypted to an empty exFAT drive (Ventoy). Using cp in Terminal it took 40sec or so, using Dolphin it took 3min or more, with a drastic decrease.

Specified App:
kf5-kio-file-widgets-5.106.0-1.fc38.x86_64
kf5-kio-widgets-libs-5.106.0-1.fc38.x86_64
kf5-kio-core-5.106.0-1.fc38.x86_64
kio-fuse-5.0.1-5.fc38.x86_64

--- Software ---
OS: Fedora Linux 38.20230605.0 (Kinoite)
KDE Plasma: 5.27.5
KDE Frameworks: 5.106.0
Qt: 5.15.9
Kernel: 6.3.5-200.fc38.x86_64
Compositor: wayland

--- Hardware ---
CPU: AMD Ryzen 5 PRO 3500U w/ Radeon Vega Mobile Gfx
RAM: 13.5 GB
GPU: AMD Radeon Vega 8 Graphics
Video memory: 2048MB

Comment 1 Henning 2023-06-05 22:46:33 UTC

* btrfs Fedora with Luks

Comment 2 Henning 2023-06-10 14:45:46 UTC

more detailed:

I try to copy a 3GB iso to a usb stick.

0-40% goes in a few seconds, after that it slows down. 40-50% takes over 30s and it seems to slow down even more

The only message I got was:

kf.kio.workers.file: Couldn't preserve group for "/run/media/user/4144-C9F2/Fedora-Kinoite-ostree-x86_64-37-1.7.iso"

But It guess this is due to the USB stick being FAT32, no support for groups, permissions