set part of the prompt beforehand to optimize the prompt function

profile.ps1

@@ -3,7 +3,8 @@ Set-PSReadlineKeyHandler -Key Tab -Function Complete
 Set-PSReadlineKeyHandler -Key Ctrl+d -Function ViExit
 #endregion keybindings
 
-function prompt {
+#region prompt dependencies
+#set part of the prompt beforehand to optimize the prompt function
 
 #depending on elevated permissions change the delimiter
 $identity = [Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()
@@ -13,11 +14,15 @@ function prompt {
     $delimiter = '$'
 }
 
+$username = $env:USERNAME.ToLower()
+$computername = $env:COMPUTERNAME.ToLower()
+#endregion prompt dependencies
+function prompt {
     #shorten path with tilde if possible
     #uses .Replace() to prevent regex
     $cwd = (Get-Location).Path.Replace($HOME,'~')
 
-    '[{0}@{1} {2}]{3} ' -f $env:USERNAME.ToLower(),$env:COMPUTERNAME.ToLower(),$cwd,$delimiter
+    '[{0}@{1} {2}]{3} ' -f $username,$computername,$cwd,$delimiter
 }
 function Get-BetterADUser {
     param (