启动终端的时候速度特别慢是什么原因？

[A3m0n]

启动终端的时候速度特别慢是什么原因？

启动的时候标题栏有 bash、-zsh 等交替出现，具体可以看下图：

大概持续 10 多秒才会能真正进入（动图的速度比实际速度慢）。

用 iTerm 也是一样的问题，ssh 连接也是。

网上查到的一些 nvm 相关的方法也尝试过了，没有效果。

贴一下 .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

# If you come from bash you might have to change your $PATH.
# export PATH=$HOME/bin:/usr/local/bin:$PATH

# Path to your oh-my-zsh installation.
export ZSH="/Users/aemon/.oh-my-zsh"

# Set name of the theme to load --- if set to "random", it will
# load a random theme each time oh-my-zsh is loaded, in which case,
# to know which specific one was loaded, run: echo $RANDOM_THEME
# See https://github.com/ohmyzsh/ohmyzsh/wiki/Themes
# ZSH_THEME="jonathan"
# ZSH_THEME="random"
ZSH_THEME="powerlevel10k/powerlevel10k"

# Set list of themes to pick from when loading at random
# Setting this variable when ZSH_THEME=random will cause zsh to load
# a theme from this variable instead of looking in $ZSH/themes/
# If set to an empty array, this variable will have no effect.
# ZSH_THEME_RANDOM_CANDIDATES=( "robbyrussell" "agnoster" )

# Uncomment the following line to use case-sensitive completion.
# CASE_SENSITIVE="true"

# Uncomment the following line to use hyphen-insensitive completion.
# Case-sensitive completion must be off. _ and - will be interchangeable.
# HYPHEN_INSENSITIVE="true"

# Uncomment the following line to disable bi-weekly auto-update checks.
# DISABLE_AUTO_UPDATE="true"

# Uncomment the following line to automatically update without prompting.
# DISABLE_UPDATE_PROMPT="true"

# Uncomment the following line to change how often to auto-update (in days).
# export UPDATE_ZSH_DAYS=13

# Uncomment the following line if pasting URLs and other text is messed up.
# DISABLE_MAGIC_FUNCTIONS="true"

# Uncomment the following line to disable colors in ls.
# DISABLE_LS_COLORS="true"

# Uncomment the following line to disable auto-setting terminal title.
# DISABLE_AUTO_TITLE="true"

# Uncomment the following line to enable command auto-correction.
# ENABLE_CORRECTION="true"

# Uncomment the following line to display red dots whilst waiting for completion.
# Caution: this setting can cause issues with multiline prompts (zsh 5.7.1 and newer seem to work)
# See https://github.com/ohmyzsh/ohmyzsh/issues/5765
# COMPLETION_WAITING_DOTS="true"

# Uncomment the following line if you want to disable marking untracked files
# under VCS as dirty. This makes repository status check for large repositories
# much, much faster.
# DISABLE_UNTRACKED_FILES_DIRTY="true"

# Uncomment the following line if you want to change the command execution time
# stamp shown in the history command output.
# You can set one of the optional three formats:
# "mm/dd/yyyy"|"dd.mm.yyyy"|"yyyy-mm-dd"
# or set a custom format using the strftime function format specifications,
# see 'man strftime' for details.
# HIST_STAMPS="mm/dd/yyyy"

# Would you like to use another custom folder than $ZSH/custom?
# ZSH_CUSTOM=/path/to/new-custom-folder

# Which plugins would you like to load?
# Standard plugins can be found in $ZSH/plugins/
# Custom plugins may be added to $ZSH_CUSTOM/plugins/
# Example format: plugins=(rails git textmate ruby lighthouse)
# Add wisely, as too many plugins slow down shell startup.
plugins=(git zsh-autosuggestions)

source $ZSH/oh-my-zsh.sh

# User configuration

# export MANPATH="/usr/local/man:$MANPATH"

# You may need to manually set your language environment
# export LANG=en_US.UTF-8

# Preferred editor for local and remote sessions
# if [[ -n $SSH_CONNECTION ]]; then
#   export EDITOR='vim'
# else
#   export EDITOR='mvim'
# fi

# Compilation flags
# export ARCHFLAGS="-arch x86_64"

# Set personal aliases, overriding those provided by oh-my-zsh libs,
# plugins, and themes. Aliases can be placed here, though oh-my-zsh
# users are encouraged to define aliases within the ZSH_CUSTOM folder.
# For a full list of active aliases, run `alias`.
#
# Example aliases
# alias zshconfig="mate ~/.zshrc"
# alias ohmyzsh="mate ~/.oh-my-zsh"

export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm

echo 'eval "$(/opt/homebrew/bin/brew shellenv)"' >> /Users/aemon/.zprofile
eval "$(/opt/homebrew/bin/brew shellenv)"

# Created by mirror-config-china
export IOJS_ORG_MIRROR=https://npm.taobao.org/mirrors/iojs
export NODIST_IOJS_MIRROR=https://npm.taobao.org/mirrors/iojs
export NVM_IOJS_ORG_MIRROR=https://npm.taobao.org/mirrors/iojs
export NVMW_IOJS_ORG_MIRROR=https://npm.taobao.org/mirrors/iojs
export NODEJS_ORG_MIRROR=https://npm.taobao.org/mirrors/node
export NODIST_NODE_MIRROR=https://npm.taobao.org/mirrors/node
export NVM_NODEJS_ORG_MIRROR=https://npm.taobao.org/mirrors/node
export NVMW_NODEJS_ORG_MIRROR=https://npm.taobao.org/mirrors/node
export NVMW_NPM_MIRROR=https://npm.taobao.org/mirrors/npm
# End of mirror-config-china
# export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles
# 如果你不是通过 Android Studio 安装的 sdk ，则其路径可能不同，请自行确定清楚
export ANDROID_HOME=$HOME/Library/Android/sdk
export PATH=$PATH:$ANDROID_HOME/emulator
export PATH=$PATH:$ANDROID_HOME/tools
export PATH=$PATH:$ANDROID_HOME/tools/bin
export PATH=$PATH:$ANDROID_HOME/platform-tools

# To customize prompt, run `p10k configure` or edit ~/.p10k.zsh.
[[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh

使用了网上查询到的计算终端启动速度的命令：

/usr/bin/time /bin/zsh -i -c exit

结果如下：

0.35 real         0.15 user         0.17 sys

感觉光 zsh 的启动速度其实并不慢，那么在启动前的这几十秒到底在做什么呢？

希望大家能帮帮忙。

我研究了一下，发现是 /usr/bin/login 命令过慢引起的，想问一下大家运行这个命令的速度怎么样？

我有什么办办法可以优化这个运行速度么？

问题解决了，感谢@Kobayashi 。

echo 'eval "$(/opt/homebrew/bin/brew shellenv)"' >> /Users/aemon/.zprofile

是这一句导致 . zprofile 文件一天比一天大，最后 zsh 启动速度越来越慢。

删除了这一句，并清空了 .zprofile 文件后，问题不再出现。

再次感谢 @Kobayashi。

[minbaby]

# 这个扔到 .zshrc 最前边
if [[ "$ZPROF" = true ]]; then
zmodload zsh/zprof
fi

#####################
# prof zsh
#####################
profzsh() {
shell=${1-$SHELL}
ZPROF=true $shell -i -c exit
}
if [[ "$ZPROF" = true ]]; then
zprof
fi

# 可以看 zsh 不同函数的执行时间

[minbaby]

如果你用了什么 nvm ，之类的东西，会导致 zsh 启动特别慢。。。可以改一下按需加载

[mcluyu]

可能跟 them 有关吧， 可以把 theme 先去掉试试，export 过多？ 不太懂

[A3m0n]

@minbaby 我加上去了，没看到有执行时间的输出，应该去哪里看呢？ nvm 我已经改过了，问题依旧。


@mcluyu 现在是使用了 p10k 的样式，但是有试过卸载，问题依旧。

[A3m0n]

补充一个视频版本的，gif 图看起来慢一点。

[jaredyam]

注释下 export 看看是不是 export 加载的问题？如果是的话可以放到 login 时加载 export ，启动 terminal 时就会快很多。远程另说。

[crysislinux]

nvm 感觉怎么改最后体验都不会好，先试试 fnm 或者 n 替换 nvm

[minbaby]

@A3m0n 加上去之后执行 profzsh 呀

[A3m0n]

@minbaby 一个函数都没有。

profzsh
num calls time self name
-----------------------------------------------------------------------------------

[Kobayashi]

1. 懒加载 nvm ，或者换到 asdf 、nodenv 等使用 shim 机制的 node 管理器。
2. 干掉 brew shellenv 。其实你的两行 brew shellenv 第一行完全不应该有，错的离谱，会导致 .zprofile 不断增大。直接把 /opt/homebrew/bin/brew shellenv 的输出结果替换掉现有的两行。

[Kobayashi]

@Kobayashi 和 login 没什么关系，你可能没搞清 login 命令，login 基本就是在 zsh -il.

[A3m0n]

@Kobayashi 万分感谢！问题确实出在 brew shellenv ，我去除了第一行 echo 'eval "$(/opt/homebrew/bin/brew shellenv)"' >> /Users/aemon/.zprofile ，然后清空了 .zprofile 成功解决了问题。

nvm 我没去动它，没什么问题。

万分感谢！！！