背景
某菜鸡有一只装了archlinux+kde的笔记本电脑。一天，某菜鸡什么都没干，仅仅进行了日常的# pacman -Syu，Konsole就坏掉了。具体症状表现为打开konsole需要15秒，占用100%cpu和13g内存。
神奇的是，这个问题只在x11下出现，wayland下没有问题。并且，某菜鸡还有一台也装了archlinux+kde的台式机，也没有出现问题。
尝试
某菜鸡分别在archlinux forum和LUG@NJU qq群内询问，得到的建议都是~/.zshrc运行时间过长，建议清理。
菜鸡卸载了使用已久的oh-my-zsh，发现问题没有解决。
菜鸡在LUG@NJU群大佬的建议下安装了终端模拟器kitty，发现kitty没有问题。菜鸡猜测是kde自身的问题。
菜鸡新建了一个空账户，发现空账户里没有问题。那么基本可以确定是账户内部settings出了问题。
我清空kde的settings，然后重新装修，发现是Win11图标的问题，换成breeze或tela就好了。
有些离谱，不过我又看到archlinux forum上的另一篇帖子，也是使用了flattery图标然后打不开dolphin，换成默认图标就好了。
还是老话，fuck U kde 😡。
后续
问题解决了，虽然不是oh-my-zsh的问题，但oh-my-zsh已经被我删了。我尝试了一下powerlevel10k主题，发现还不错。
powerlevel10k的完全体需要MesloLGS NF字体，我尝试在fontconfig中设置nerd字体的fallback，但失败了。无奈之下还是安装了MesloLGS NF。
powerlevel10k好看且速度快，但它毕竟只是一个主题。一些oh-my-zsh开箱自带的功能现在需要手动配。
我安装了zsh-history-substring-search插件以实现按up键历史搜索功能。它不仅可以匹配前缀，还可以匹配子串。
zsh-history-substring-search与zsh-vi-mode有点冲突，在台式机上按照推荐设置
bindkey '^[[A' history-substring-search-up
bindkey '^[[B' history-substring-search-down
无法正常工作。参考issue，需要使用：
zvm_after_init_commands+=("bindkey '^[[A' history-substring-search-up && bindkey '^[[B' history-substring-search-down")`
但推荐设置在安装了相同的插件的笔记本上就能正常工作，我不明白😕。
我现在的~/.zshrc:
# Enable Powerlevel10k instant prompt. Should stay close to the top of ~/.zshrc.
# Initialization code that may require console input (password prompts, [y/n]
# confirmations, etc.) must go above this block; everything else may go below.
if [[ -r "${XDG_CACHE_HOME:-$HOME/.cache}/p10k-instant-prompt-${(%):-%n}.zsh" ]]; then
source "${XDG_CACHE_HOME:-$HOME/.cache}/p10k-instant-prompt-${(%):-%n}.zsh"
fi
source /usr/share/zsh-theme-powerlevel10k/powerlevel10k.zsh-theme
# To customize prompt, run `p10k configure` or edit ~/.p10k.zsh.
[[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh
# plugins installed by pacman/yay/paru
source /usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
source /usr/share/zsh/plugins/zsh-autosuggestions/zsh-autosuggestions.zsh
source /usr/share/zsh/plugins/zsh-vi-mode/zsh-vi-mode.zsh
# zsh history substring search
source /usr/share/zsh/plugins/zsh-history-substring-search/zsh-history-substring-search.zsh
: ${HISTORY_SUBSTRING_SEARCH_ENSURE_UNIQUE='true'}
# make zsh history substring search work with zsh-vi-mode
zvm_after_init_commands+=("bindkey '^[[A' history-substring-search-up && bindkey '^[[B' history-substring-search-down")
# may not work
#bindkey '^[[A' history-substring-search-up
#bindkey '^[[B' history-substring-search-down
# zsh set history, based on oh-my-zsh https://github.com/ohmyzsh/ohmyzsh/blob/master/lib/history.zsh
HISTFILE=$HOME/.zsh_history
HISTSIZE=50000
SAVEHIST=10000
setopt extended_history
setopt hist_expire_dups_first
setopt hist_ignore_all_dups
setopt hist_ignore_space
setopt hist_verify
setopt share_history
setopt inc_append_history
并且，我把konsole的配色方案从breeze改成了基于Sweet下的Ambar-Blue的配色。kde的konsole配置文件和配色方案都在~/.local/share/konsole/里。
[Background]
Color=16,16,19
RandomHueRange=360
RandomSaturationRange=100
[BackgroundFaint]
Color=16,16,19
RandomHueRange=360
RandomSaturationRange=100
[BackgroundIntense]
Color=16,16,19
RandomHueRange=360
RandomSaturationRange=100
[Color0]
Color=35,38,39
[Color0Faint]
Color=49,54,59
[Color0Intense]
Color=127,140,141
[Color1]
Color=237,37,78
[Color1Faint]
Color=237,37,78
[Color1Intense]
Color=237,37,78
[Color2]
Color=113,247,159
[Color2Faint]
Color=113,247,159
[Color2Intense]
Color=113,247,159
[Color3]
Color=250,221,0
[Color3Faint]
Color=250,221,0
[Color3Intense]
Color=250,221,0
[Color4]
Color=0,114,255
[Color4Faint]
Color=0,114,255
[Color4Intense]
Color=0,114,255
[Color5]
Color=212,0,220
[Color5Faint]
Color=212,0,220
[Color5Intense]
Color=247,105,255
[Color6]
Color=0,193,228
[Color6Faint]
Color=122,188,200
[Color6Intense]
Color=82,200,200
[Color7]
Color=252,252,252
[Color7Faint]
Color=99,104,109
[Color7Intense]
Color=255,255,255
[Foreground]
Color=252,252,252
RandomHueRange=360
RandomSaturationRange=100
[ForegroundFaint]
Color=239,240,241
RandomHueRange=360
RandomSaturationRange=100
[ForegroundIntense]
Color=255,255,255
RandomHueRange=360
RandomSaturationRange=100
[General]
Anchor=0.5,0.5
Blur=false
ColorRandomization=false
Description=Sweet-Ambar-Blue-m
FillStyle=Tile
Opacity=0.8
Wallpaper=
WallpaperFlipType=NoFlip
WallpaperOpacity=1