diff --git a/fish/config/config.fish b/fish/config/config.fish
index d6c39d5..9dc88d6 100644
--- a/fish/config/config.fish
+++ b/fish/config/config.fish
@@ -107,7 +107,7 @@ end
 # auto startx
 if test -z "$STARTED" -a -z "$DISPLAY" -a -n "$XDG_VTNR" -a "$XDG_VTNR" -eq "1"
     set -gx STARTED true
-    startx
+    exec startx
 end
 
 if status is-interactive
diff --git a/fish/install.sh b/fish/install.sh
index 12400a4..d55eb02 100755
--- a/fish/install.sh
+++ b/fish/install.sh
@@ -10,7 +10,7 @@ case "$PM" in
         ! which pip3 && $ROOT/python/install.sh
         sudo add-apt-repository ppa:fish-shell/release-3 -y
         sudo apt update
-        sudo apt install fish libnotify-bin xdotool silversearcher-ag -y
+        sudo apt install fish libnotify-bin xdotool silversearcher-ag dash -y
         if apt show fzf &>/dev/null; then
             sudo apt install fzf
         elif ! which fzf &>/dev/null; then
@@ -20,14 +20,30 @@ case "$PM" in
         ;;
     pacman)
         ! which pip && $ROOT/python/install.sh
-        sudo pacman -S --needed --needed fish xdotool fzf the_silver_searcher
+        sudo pacman -S --needed --needed fish xdotool fzf the_silver_searcher dash
+        # prevent bash upgradation relink /bin/sh
+        sudo mkdir -p /etc/pacman.d/hooks
+        cat <<-EOT | sed 's/^ *//' | sudo tee /etc/pacman.d/sh-is-dash.hook
+        [Trigger]
+        Type = Package
+        Operation = Install
+        Operation = Upgrade
+        Target = bash
+
+        [Action]
+        Description = Re-pointing /bin/sh symlink to dash...
+        When = PostTransaction
+        Exec = /usr/bin/ln -sfT dash /usr/bin/sh
+        Depends = dash
+        EOT
         ;;
 esac
 
-# set fish as default shell
-if ! fish-is-default-shell; then
-    chsh -s $FISH_SHELL
-fi
+# use dash as default shell because it much faster and will be used  vim-fugitive,
+# which leads to a much faster responsive speed
+sudo /usr/bin/ln -sfT dash /usr/bin/sh
+chsh -s /bin/sh
+
 
 # symlink config
 [ -L $XDG_CONFIG_HOME/fish ] && rm -rf $XDG_CONFIG_HOME/fish
diff --git a/nodejs/install.sh b/nodejs/install.sh
index cf0a240..5781efa 100755
--- a/nodejs/install.sh
+++ b/nodejs/install.sh
@@ -32,7 +32,7 @@ fi
 
 
 # install nvm
-if fish-is-default-shell; then
+if which fish 2>/dev/null; then
     fish -c "fisher add jorgebucaran/nvm.fish"
 else
     curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash
diff --git a/python/install.sh b/python/install.sh
index 7a717e7..b34bb8d 100755
--- a/python/install.sh
+++ b/python/install.sh
@@ -16,15 +16,15 @@ fi
 case "$PM" in
     apt)
         sudo apt install python3 python3-pip python-is-python3
-        fish-is-default-shell && sudo pip3 install virtualfish
+        which fish 2>/dev/null && sudo pip3 install virtualfish
         ;;
     pacman)
         sudo pacman -S --needed python python-pip
-        fish-is-default-shell && sudo pip install virtualfish
+        which fish 2>/dev/null && sudo pip install virtualfish
         ;;
 esac
 
 # enable auto_activation plugin for virtualfish
-fish-is-default-shell && fish -c "yes | vf install && vf addplugins auto_activation"
+which fish 2>/dev/null && fish -c "yes | vf install && vf addplugins auto_activation"