Hello everyone,

I´m getting high cpu usage when copying files to usb. It doesnt matter if its fat32,ntfs. It also doesnt matter if Im using dolphin,krusader or just downloading a file from firefox to a usb. Here are my specs:

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System:    Host: <filter> Kernel: 5.8.16-antix.1-amd64-smp x86_64 bits: 64 compiler: N/A
           parameters: BOOT_IMAGE=/boot/vmlinuz-5.8.16-antix.1-amd64-smp
           root=UUID=<filter> ro quiet splash
           Desktop: KDE Plasma 5.14.5 tk: Qt 5.11.3 wm: kwin_x11 dm: LightDM 1.26.0
           Distro: MX-19.4_x64 patito feo May 31  2020 base: Debian GNU/Linux 10 (buster)
Machine:   Type: Laptop System: Gateway product: NV54 Series v: 0100 serial: <filter> Chassis:
           type: 10 serial: <filter>
           Mobo: Gateway model: SJV50MV v: Rev serial: <filter> BIOS: Phoenix v: 1.30
           date: 10/25/2009
Battery:   ID-1: BAT0 charge: 25.7 Wh condition: 26.6/48.8 Wh (55%) volts: 12.3/11.1
           model: SMP-PA22 AS09A71 type: Li-ion serial: <filter> status: Unknown
CPU:       Topology: Dual Core model: Intel Core2 Duo T9300 bits: 64 type: MCP arch: Penryn
           family: 6 model-id: 17 (23) stepping: 6 microcode: 60F L2 cache: 6144 KiB
           flags: lm nx pae sse sse2 sse3 sse4_1 ssse3 vmx bogomips: 9975
           Speed: 2385 MHz min/max: 1200/2500 MHz Core speeds (MHz): 1: 2385 2: 2123
           Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled
           Type: l1tf mitigation: PTE Inversion; VMX: EPT disabled
           Type: mds status: Vulnerable: Clear CPU buffers attempted, no microcode; SMT disabled
           Type: meltdown mitigation: PTI
           Type: spec_store_bypass status: Vulnerable
           Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
           Type: spectre_v2 mitigation: Full generic retpoline, STIBP: disabled, RSB filling
           Type: srbds status: Not affected
           Type: tsx_async_abort status: Not affected
Graphics:  Device-1: Intel Mobile 4 Series Integrated Graphics vendor: Acer Incorporated ALI
           driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:2a42
           Display: x11 server: X.Org 1.20.4 driver: intel compositor: kwin_x11
           resolution: 1366x768~60Hz
           OpenGL: renderer: Mesa DRI Mobile Intel GM45 Express v: 2.1 Mesa 18.3.6
           direct render: Yes
Audio:     Device-1: Intel 82801I HD Audio vendor: Acer Incorporated ALI driver: snd_hda_intel
           v: kernel bus ID: 00:1b.0 chip ID: 8086:293e
           Sound Server: ALSA v: k5.8.16-antix.1-amd64-smp
Network:   Device-1: Broadcom Limited NetLink BCM5784M Gigabit Ethernet PCIe
           vendor: Acer Incorporated ALI driver: tg3 v: kernel port: 1c00 bus ID: 02:00.0
           chip ID: 14e4:1698
           IF: eth0 state: down mac: <filter>
           Device-2: Qualcomm Atheros AR928X Wireless Network Adapter
           vendor: Foxconn T77H047.31 802.11bgn driver: ath9k v: kernel port: 1c00
           bus ID: 03:00.0 chip ID: 168c:002a
           IF: wlan0 state: up mac: <filter>
Drives:    Local Storage: total: 465.76 GiB used: 304.18 GiB (65.3%)
           ID-1: /dev/sda vendor: HGST (Hitachi) model: HTS725050A7E630 size: 465.76 GiB
           block size: physical: 4096 B logical: 512 B speed: 3.0 Gb/s rotation: 7200 rpm
           serial: <filter> rev: C360 scheme: MBR
Partition: ID-1: / raw size: 463.73 GiB size: 455.45 GiB (98.21%) used: 304.18 GiB (66.8%)
           fs: ext4 dev: /dev/sda1
           ID-2: swap-1 size: 2.00 GiB used: 0 KiB (0.0%) fs: swap swappiness: 15 (default 60)
           cache pressure: 100 (default) dev: /dev/sda2
Sensors:   System Temperatures: cpu: 42.0 C mobo: N/A
           Fan Speeds (RPM): N/A
Repos:     No active apt repos in: /etc/apt/sources.list
           Active apt repos in: /etc/apt/sources.list.d/debian-stable-updates.list
           1: deb http://deb.debian.org/debian buster-updates main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/debian.list
           1: deb http://deb.debian.org/debian buster main contrib non-free
           2: deb http://deb.debian.org/debian-security buster/updates main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/mx.list
           1: deb http://mirror.cedia.org.ec/mx-workspace/mx/repo/ buster main non-free
           No active apt repos in: /etc/apt/sources.list.d/softmaker.list
           No active apt repos in: /etc/apt/sources.list.d/various.list
           Active apt repos in: /etc/apt/sources.list.d/vivaldi.list
           1: deb http://repo.vivaldi.com/stable/deb/ stable main
Info:      Processes: 212 Uptime: 30m Memory: 3.77 GiB used: 1.48 GiB (39.1%) Init: SysVinit
           v: 2.93 runlevel: 5 default: 5 Compilers: gcc: 8.3.0 alt: 8 Shell: quick-system-in
           running in: quick-system-in inxi: 3.0.36


Bug reports need to go either to your distribution or to https://bugs.kde.org, the forum is the wrong place for this.

FWIW: your Plasma version is rather old, so if you want to report it somewhere your distribution is the only solution, as we do not support this version anymore on our side (the same is valid for all versions older than Plasma 5.1.8.x)

Sounds like you are running Debian.
In my experience with a few distros, such as OpenSuse, Kubuntu, Linux Mint, high CPU usage when writing to a USB stick is normal. That's just the way that Linux is programmed. Sometimes 1 core goes to 100%, sometimes up to 4 cores.
It doesn't matter if the format is FAT32, NTFS, exFAT.