diff --git a/lib/termsupport.zsh b/lib/termsupport.zsh
index 852a543c5..622821304 100644
--- a/lib/termsupport.zsh
+++ b/lib/termsupport.zsh
@@ -146,16 +146,22 @@ esac
 # the host name to disambiguate local vs. remote paths.
 function omz_termsupport_cwd {
   setopt localoptions unset
-  # Percent-encode the host and path names.
-  local URL_HOST URL_PATH
-  URL_HOST="$(omz_urlencode -P $HOST)" || return 1
-  URL_PATH="$(omz_urlencode -P $PWD)" || return 1
+  # Percent-encode the host and path names. Encoding forks a subshell each,
+  # so keep the result and only redo it when $HOST or $PWD changed.
+  if [[ "$_omz_termsupport_cwd_key" != "$HOST:$PWD" ]]; then
+    local URL_HOST URL_PATH
+    URL_HOST="$(omz_urlencode -P $HOST)" || return 1
+    URL_PATH="$(omz_urlencode -P $PWD)" || return 1
 
-  # Konsole errors if the HOST is provided
-  [[ -z "$KONSOLE_PROFILE_NAME" && -z "$KONSOLE_DBUS_SESSION"  ]] || URL_HOST=""
+    # Konsole errors if the HOST is provided
+    [[ -z "$KONSOLE_PROFILE_NAME" && -z "$KONSOLE_DBUS_SESSION"  ]] || URL_HOST=""
+
+    typeset -g _omz_termsupport_cwd_key="$HOST:$PWD"
+    typeset -g _omz_termsupport_cwd_url="file://${URL_HOST}${URL_PATH}"
+  fi
 
   # common control sequence (OSC 7) to set current host and path
-  printf "\e]7;file://%s%s\e\\" "${URL_HOST}" "${URL_PATH}"
+  printf "\e]7;%s\e\\" "$_omz_termsupport_cwd_url"
 }
 
 # Use a precmd hook instead of a chpwd hook to avoid contaminating output