Potential performance regression in 2026.6.2: mise which resolves entire toolset and increases shell startup from ~2.5s to ~65s

[HYP3R00T]

I believe I may have encountered a performance regression in mise 2026.6.2.

After upgrading, my ZSH startup time increased from approximately 2-3 seconds to approximately 65 seconds. The only change was upgrading mise.

To investigate, I profiled shell startup using zprof.

The results suggested that repeated mise invocations became significantly more expensive after the upgrade. In my setup, this manifested as extremely slow shell startup because several mise commands are executed during shell initialization.

As a test, I downgraded to the previous release and reran the exact same measurements.

Observed results:

• mise 2026.6.2: ~65 second shell startup
• Previous release: ~2.5 second shell startup
• Same machine
• Same WSL installation
• Same shell configuration
• Same toolset

I've included the following below:

• zprof output from 2026.6.2
• zprof output from the previous release

The downgrade alone resolved the issue, which makes me suspect a regression introduced in 2026.6.2.

Please let me know if there are additional diagnostics that would be helpful.

For version 2026.6.2

time zsh -f -i -c exit
zsh -f -i -c exit  0.00s user 0.00s system 20% cpu 0.010 total

time zsh -i -c exit
zsh -i -c exit  1.53s user 1.00s system 3% cpu 1:05.32 total

# zprof
num  calls                time                       self            name
-----------------------------------------------------------------------------------
 1)   22       54412.46  2473.29   99.71%  54412.46  2473.29   99.71%  mise
 2)    1         139.46   139.46    0.26%    139.46   139.46    0.26%  _mise_hook
 3)    1          12.81    12.81    0.02%      9.09     9.09    0.02%  compinit
 4)    2           3.72     1.86    0.01%      3.72     1.86    0.01%  compaudit
 5)    1           2.98     2.98    0.01%      2.93     2.93    0.01%  _zsh_highlight_load_highlighters
 6)    1           0.77     0.77    0.00%      0.77     0.77    0.00%  _zsh_highlight__function_callable_p
 7)    9           0.71     0.08    0.00%      0.71     0.08    0.00%  compdef
 8)    9           0.67     0.07    0.00%      0.67     0.07    0.00%  add-zsh-hook
 9)    3           0.53     0.18    0.00%      0.50     0.17    0.00%  add-zle-hook-widget
10)    3           0.40     0.13    0.00%      0.40     0.13    0.00%  is-at-least
11)    1           0.10     0.10    0.00%      0.10     0.10    0.00%  (anon) [/home/hyperoot/.zsh/zsh-autosuggestions/zsh-autosuggestions.zsh:460]
12)    1           0.14     0.14    0.00%      0.08     0.08    0.00%  complete
13)    1           0.03     0.03    0.00%      0.03     0.03    0.00%  (anon) [/usr/share/zsh/functions/Misc/add-zle-hook-widget:28]
14)    1           0.02     0.02    0.00%      0.02     0.02    0.00%  bashcompinit
15)    1           0.01     0.01    0.00%      0.01     0.01    0.00%  _zsh_highlight__is_function_p
16)    1           0.00     0.00    0.00%      0.00     0.00    0.00%  _zsh_highlight_bind_widgets

mise doctor
version: 2026.6.2 linux-x64 (2026-06-09)
activated: yes
shims_on_path: yes
self_update_available: yes

build_info:
  Target: x86_64-unknown-linux-gnu
  Features: openssl, rustls-native-roots, self_update
  Built: Tue, 9 Jun 2026 17:28:28 +0000
  Rust Version: rustc 1.94.0 (4a4ef493e 2026-03-02)
  Profile: release

shell:
  /usr/bin/zsh
  zsh 5.9 (x86_64-ubuntu-linux-gnu)

aqua:
  baked in registry: aquaproj/aqua-registry@b2116015b48a040543836bbd35f8ca3a3313698e
  baked in registry tools: 2218

dirs:
  cache: ~/.cache/mise
  config: ~/.config/mise
  data: ~/.local/share/mise
  shims: ~/.local/share/mise/shims
  state: ~/.local/state/mise

config_files:
  ~/.config/mise/config.toml

env_files:
  (none)

ignored_config_files: (none)

backends:
  aqua
  asdf
  cargo
  conda
  core
  dotnet
  forgejo
  gem
  github
  gitlab
  go
  npm
  pipx
  spm
  http
  s3
  ubi
  vfox

plugins:

toolset:
  aqua:BurntSushi/ripgrep@15.1.0
  aqua:ajeetdsouza/zoxide@0.9.9
  aqua:aristocratos/btop@1.4.7
  aqua:astral-sh/uv@0.11.20
  aqua:bootandy/dust@1.2.4
  aqua:derailed/k9s@0.51.0
  aqua:direnv/direnv@2.37.1
  aqua:eza-community/eza@0.23.4
  aqua:fastfetch-cli/fastfetch@2.64.2
  aqua:fluxcd/flux2@2.8.8
  aqua:hashicorp/terraform@1.15.6
  aqua:hashicorp/vault@2.0.2
  aqua:jesseduffield/lazydocker@0.25.2
  aqua:jqlang/jq@1.8.1
  aqua:junegunn/fzf@0.73.1
  aqua:koalaman/shellcheck@0.11.0
  aqua:kubernetes/kubernetes/kubectl@1.36.1
  aqua:mvdan/sh@3.13.1
  aqua:noahgorstein/jqp@0.8.0
  aqua:sharkdp/bat@0.26.1
  aqua:starship/starship@1.25.1
  aqua:wagoodman/dive@0.13.1
  core:node@22.22.3
  core:rust@1.96.0
  npm:wrangler@4.99.0
  vfox:mise-plugins/vfox-gcloud@572.0.0

path:
  ~/.local/share/mise/installs/bat/latest/bat-v0.26.1-x86_64-unknown-linux-musl
  ~/.local/share/mise/installs/btop/latest/btop/bin
  ~/.local/share/mise/installs/direnv/latest
  ~/.local/share/mise/installs/dive/latest
  ~/.local/share/mise/installs/dust/latest/dust-v1.2.4-x86_64-unknown-linux-musl
  ~/.local/share/mise/installs/eza/latest
  ~/.local/share/mise/installs/fastfetch/latest/fastfetch-linux-amd64/usr/bin
  ~/.local/share/mise/installs/flux2/latest
  ~/.local/share/mise/installs/fzf/latest
  ~/.local/share/mise/installs/gcloud/latest/bin
  ~/.local/share/mise/installs/jq/latest
  ~/.local/share/mise/installs/jqp/latest
  ~/.local/share/mise/installs/k9s/latest
  ~/.local/share/mise/installs/kubectl/latest
  ~/.local/share/mise/installs/lazydocker/latest
  ~/.local/share/mise/installs/node/22/bin
  ~/.local/share/mise/installs/ripgrep/latest/ripgrep-15.1.0-x86_64-unknown-linux-musl
  ~/.cargo/bin
  ~/.local/share/mise/installs/shellcheck/latest/shellcheck-v0.11.0
  ~/.local/share/mise/installs/shfmt/latest
  ~/.local/share/mise/installs/starship/latest
  ~/.local/share/mise/installs/terraform/latest
  ~/.local/share/mise/installs/uv/latest/uv-x86_64-unknown-linux-musl
  ~/.local/share/mise/installs/vault/latest
  ~/.local/share/mise/installs/wrangler/latest/bin
  ~/.local/share/mise/installs/zoxide/latest
  ~/.local/share/mise/shims
  ~/.local/bin
  ~/.local/share/mise/shims
  ~/.local/bin
  /usr/local/sbin
  /usr/local/bin
  /usr/sbin
  /usr/bin
  /sbin
  /bin
  /usr/games
  /usr/local/games
  /usr/lib/wsl/lib
  /mnt/c/WINDOWS/system32
  /mnt/c/WINDOWS
  /mnt/c/WINDOWS/System32/Wbem
  /mnt/c/WINDOWS/System32/WindowsPowerShell/v1.0/
  /mnt/c/WINDOWS/System32/OpenSSH/
  /mnt/c/Program Files/dotnet/
  /mnt/c/Users/Rajes/AppData/Local/Programs/cursor/resources/app/bin
  /mnt/c/Program Files/NVIDIA Corporation/NVIDIA App/NvDLISR
  /mnt/c/Program Files (x86)/NVIDIA Corporation/PhysX/Common
  /mnt/c/Program Files/Git/cmd
  /mnt/c/Program Files/starship/bin/
  /mnt/c/Program Files/PowerShell/7/
  /mnt/c/Program Files/nodejs/
  /mnt/c/Program Files/GitHub CLI/
  /mnt/c/Program Files/Pandoc/
  /mnt/c/Users/Rajes/AppData/Local/Programs/Python/Launcher/
  /mnt/c/texlive/2025/bin/windows
  /mnt/c/WINDOWS/system32/config/systemprofile/AppData/Local/Microsoft/WindowsApps
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/astral-sh.uv_Microsoft.Winget.Source_8wekyb3d8bbwe
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/ajeetdsouza.zoxide_Microsoft.Winget.Source_8wekyb3d8bbwe
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/Hashicorp.Terraform_Microsoft.Winget.Source_8wekyb3d8bbwe
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/Derailed.k9s_Microsoft.Winget.Source_8wekyb3d8bbwe
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/Fastfetch-cli.Fastfetch_Microsoft.Winget.Source_8wekyb3d8bbwe
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/twpayne.chezmoi_Microsoft.Winget.Source_8wekyb3d8bbwe
  /mnt/c/Users/Rajes/AppData/Local/Programs/Microsoft VS Code/bin
  /mnt/c/Users/Rajes/AppData/Local/Programs/Lens/resources/cli/bin
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WindowsApps
  /mnt/c/Users/Rajes/AppData/Roaming/Code/User/globalStorage/ms-vscode-remote.remote-containers/cli-bin
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/eza-community.eza_Microsoft.Winget.Source_8wekyb3d8bbwe
  /mnt/c/Users/Rajes/AppData/Local/mise/shims
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Links
  /mnt/c/bin/flutter/bin
  /mnt/c/bin/cmdline-tools/bin
  /mnt/c/Users/Rajes/AppData/Local/mise/shims
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/DenoLand.Deno_Microsoft.Winget.Source_8wekyb3d8bbwe
  /mnt/c/users/rajes/appdata/roaming/python/python314/scripts
  /mnt/c/users/rajes/.local/bin
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/OpenAI.Codex_Microsoft.Winget.Source_8wekyb3d8bbwe
  /mnt/d/hive
  /mnt/c/Users/Rajes/AppData/Local/Programs/Ollama
  /mnt/c/Users/Rajes/AppData/Local/Programs/Obsidian
  /mnt/c/Users/Rajes/AppData/Local/Programs/Kiro/bin
  /mnt/c/Users/Rajes/AppData/Local/Programs/IBM Bob/bin
  /mnt/c/Users/Rajes/AppData/Local/Programs/Antigravity/bin
  /mnt/c/Users/Rajes/AppData/Local/Programs/Zed/bin
  /mnt/c/Users/Rajes/AppData/Roaming/npm
  /mnt/c/Users/Rajes/AppData/Local/Programs/Antigravity IDE/bin
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/Genymobile.scrcpy_Microsoft.Winget.Source_8wekyb3d8bbwe/scrcpy-win64-v4.0
  /mnt/c/Users/Rajes/AppData/Local/Kiro-Cli/
  /mnt/c/Users/Rajes/AppData/Local/PowerToys/DSCModules/
  /mnt/c/Users/Rajes/AppData/Local/Programs/DockerDesktop/resources/bin
  /mnt/c/Users/Rajes/AppData/Local/GitHubDesktop/bin
  /mnt/c/Users/Rajes/AppData/Local/Microsoft/WinGet/Packages/jdx.mise_Microsoft.Winget.Source_8wekyb3d8bbwe/mise/bin
  ~/.iximiuz/labctl/bin
  ~/.iximiuz/labctl/bin

env_vars:
  MISE_SHELL=zsh

settings:

No problems found

For version 2026.6.1

time zsh -f -i -c exit
zsh -f -i -c exit  0.00s user 0.00s system 89% cpu 0.002 total

time zsh -i -c exit
zsh -i -c exit  0.42s user 0.45s system 35% cpu 2.466 total

# zprof
num  calls                time                       self            name
-----------------------------------------------------------------------------------
 1)   22        1623.58    73.80   91.71%   1623.58    73.80   91.71%  mise
 2)    1         127.47   127.47    7.20%    127.47   127.47    7.20%  _mise_hook
 3)    1          13.07    13.07    0.74%      9.39     9.39    0.53%  compinit
 4)    2           3.68     1.84    0.21%      3.68     1.84    0.21%  compaudit
 5)    1           2.99     2.99    0.17%      2.94     2.94    0.17%  _zsh_highlight_load_highlighters
 6)    1           0.85     0.85    0.05%      0.84     0.84    0.05%  _zsh_highlight__function_callable_p
 7)    9           0.71     0.08    0.04%      0.71     0.08    0.04%  add-zsh-hook
 8)    9           0.68     0.08    0.04%      0.68     0.08    0.04%  compdef
 9)    3           0.44     0.15    0.03%      0.44     0.15    0.03%  is-at-least
10)    3           0.43     0.14    0.02%      0.39     0.13    0.02%  add-zle-hook-widget
11)    1           0.09     0.09    0.01%      0.09     0.09    0.01%  (anon) [/home/hyperoot/.zsh/zsh-autosuggestions/zsh-autosuggestions.zsh:460]
12)    1           0.13     0.13    0.01%      0.07     0.07    0.00%  complete
13)    1           0.03     0.03    0.00%      0.03     0.03    0.00%  (anon) [/usr/share/zsh/functions/Misc/add-zle-hook-widget:28]
14)    1           0.02     0.02    0.00%      0.02     0.02    0.00%  bashcompinit
15)    1           0.01     0.01    0.00%      0.01     0.01    0.00%  _zsh_highlight__is_function_p
16)    1           0.00     0.00    0.00%      0.00     0.00    0.00%  _zsh_highlight_bind_widgets

.zshrc

#!/usr/bin/zsh

zmodload zsh/zprof

# Load completion system
autoload -Uz compinit
compinit

# Option configuration
HISTSIZE=2000
HISTFILE=~/.zsh_history
SAVEHIST=$HISTSIZE
HISTDUP=erase
setopt APPENDHISTORY          # Append history lines to the history file, rather than overwriting it.
setopt SHAREHISTORY           # Share history between all sessions.
setopt HIST_IGNORE_SPACE      # Ignore commands that start with a space.
setopt HIST_IGNORE_ALL_DUPS   # Remove all previous duplicates of a command from the history list when added.
setopt HIST_SAVE_NO_DUPS      # Don't write duplicate entries in the history file.
setopt HIST_IGNORE_DUPS       # Don't record an entry that was just recorded again.
setopt HIST_FIND_NO_DUPS      # Do not display a line previously found.
setopt BANG_HIST              # Treat the '!' character specially during expansion.
setopt INC_APPEND_HISTORY     # Write to the history file immediately, not when the shell exits.
setopt HIST_EXPIRE_DUPS_FIRST # Expire duplicate entries first when trimming history.

# Completion styling
zstyle ':completion:*' menu no                 # Disable menu-based selection during tab completion.
zstyle ':completion:*' accept-exact '*(N)'     # Automatically accept exact matches when completing.
zstyle ':completion:*' use-cache on            # Enable caching for faster completion results.
zstyle ':completion:*' cache-path ~/.zsh/cache # Define the location to store the completion cache.

# Keybindings
autoload -U up-line-or-beginning-search
autoload -U down-line-or-beginning-search

zle -N up-line-or-beginning-search
zle -N down-line-or-beginning-search

bindkey "${terminfo[kcuu1]}" up-line-or-beginning-search
bindkey "${terminfo[kcud1]}" down-line-or-beginning-search
bindkey '^[[C' forward-char
bindkey '^[[D' backward-char
bindkey "^[[1;5D" backward-word
bindkey "^[[1;5C" forward-word
bindkey "^H" backward-kill-word
bindkey "^?" backward-delete-char

# Aliases
alias ls='ls --color'
alias py="python3"
alias pya="source ./.venv/bin/activate"

# Manage paths
export PATH="$HOME/.local/share/mise/shims:$HOME/.local/bin:$PATH"

# mise setup
eval "$(mise activate zsh)"

# starship setup
if ! mise which starship &>/dev/null; then
	mise use -g starship@latest
	eval "$(mise activate zsh)"
fi
eval "$(starship init zsh)"

# kubectl setup
if ! mise which kubectl &>/dev/null; then
	mise use -g kubectl@latest
	eval "$(mise activate zsh)"
fi
source <(kubectl completion zsh)
alias k="kubectl"

# terraform setup
if ! mise which terraform &>/dev/null; then
	mise use -g terraform@latest
	eval "$(mise activate zsh)"
fi
alias tf="terraform"

# zoxide setup
if ! mise which zoxide &>/dev/null; then
	mise use -g zoxide@latest
	eval "$(mise activate zsh)"
fi
eval "$(zoxide init zsh --cmd cd)"

# fzf setup
if ! mise which fzf &>/dev/null; then
	mise use -g fzf@latest
	eval "$(mise activate zsh)"
fi
source <(fzf --zsh)
[ -f ~/.fzf.zsh ] && source ~/.fzf.zsh
export FZF_DEFAULT_OPTS=" \
--color=fg:15,bg:0,hl:14 \
--color=fg+:15,bg+:0,hl+:12 \
--color=info:10,prompt:9,pointer:13 \
--color=marker:10,spinner:13,header:6 \
--multi"

# bat setup
if ! mise which bat &>/dev/null; then
	mise use -g bat@latest
	eval "$(mise activate zsh)"
	bat cache --build
fi
alias cat="bat"

# dust setup
if ! mise which dust &>/dev/null; then
	mise use -g dust@latest
	eval "$(mise activate zsh)"
fi

# fastfetch setup
if ! mise which fastfetch &>/dev/null; then
	mise use -g fastfetch@latest
	eval "$(mise activate zsh)"
fi

# dive setup
if ! mise which dive &>/dev/null; then
	mise use -g dive@latest
	eval "$(mise activate zsh)"
fi

# btop setup
if ! mise which btop &>/dev/null; then
	mise use -g btop@latest
	eval "$(mise activate zsh)"
fi

# eza setup
if ! mise which eza &>/dev/null; then
	mise use -g eza@latest
	eval "$(mise activate zsh)"
fi
alias ls="eza -al --icons --group-directories-first --git --time-style=relative"
alias tree="eza --tree --icons --git-ignore -a"

# shfmt setup
if ! mise which shfmt &>/dev/null; then
	mise use -g shfmt@latest
	eval "$(mise activate zsh)"
fi

# shellcheck setup
if ! mise which shellcheck &>/dev/null; then
	mise use -g shellcheck@latest
	eval "$(mise activate zsh)"
fi

# jq setup
if ! mise which jq &>/dev/null; then
	mise use -g jq@latest
	eval "$(mise activate zsh)"
fi

# jqp setup
if ! mise which jqp &>/dev/null; then
	mise use -g jqp@latest
	eval "$(mise activate zsh)"
fi

# flux2 setup
if ! mise which flux &>/dev/null; then
	mise use -g flux2@latest
	eval "$(mise activate zsh)"
fi
source <(flux completion zsh)

# k9s setup
if ! mise which k9s &>/dev/null; then
	mise use -g k9s@latest
	eval "$(mise activate zsh)"
fi

# vault setup
if ! mise which vault &>/dev/null; then
	mise use -g vault@latest
	eval "$(mise activate zsh)"
fi
autoload -U +X bashcompinit && bashcompinit
complete -o nospace -C vault vault

# direnv setup
if ! mise which direnv &>/dev/null; then
	mise use -g direnv@latest
	eval "$(mise activate zsh)"
fi
eval "$(direnv hook zsh)"

# ripgrep setup
if ! mise which rg &>/dev/null; then
	mise use -g ripgrep@latest
	eval "$(mise activate zsh)"
fi

# lazydocker setup
if ! mise which lazydocker &>/dev/null; then
	mise use -g lazydocker@latest
	eval "$(mise activate zsh)"
fi
alias ld=lazydocker

# uv setup
if ! mise which uv &>/dev/null; then
	mise use -g uv@latest
	eval "$(mise activate zsh)"
fi
eval "$(uv generate-shell-completion zsh)"
eval "$(uvx --generate-shell-completion zsh)"

# Plugins
ZSH_AUTOSUGGEST_BUFFER_MAX_SIZE=20
ZSH_AUTOSUGGEST_USE_ASYNC=true
ZSH_AUTOSUGGEST_MANUAL_REBIND=true
ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE="fg=#7f849c"
# Autosuggestions
source ~/.zsh/zsh-autosuggestions/zsh-autosuggestions.zsh
# Syntax highlighting (always last)
source ~/.zsh/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh

export COLORTERM=truecolor

export PATH=$PATH:/home/hyperoot/.iximiuz/labctl/bin
source <(labctl completion zsh)

zprof

[jdx]

#10315