Export all AD users and memberof name (not CN)

I have a PowerShell script which grabs all users from AD and throws out the SamAccountName & their Memberof into two separate columns. I am trying to figure out how I can amend this script so that the Memeberof column only outputs the group name and not the full CN. Can anyone offer some help please? Script:

Get-ADUser -Filter * -Properties memberof| Select samaccountname, @{n='memberOf';e={$_.memberOf -join '; '}} | Export-Csv D:\Reports\groupstest.csv -NTI

Just for some further information, I did have a script that accomplished what I wanted, but for some reason it wasn't exporting all AD users (unlike the above script), there was about 1200 or so records that were missing from the export - the script used for that was this:

Import-Module ActiveDirectory
Get-ADUser -Filter * -Properties SamAccountName,memberof | % {
  New-Object PSObject -Property @{
      UserName = $_.SamAccountName
      Groups = ($_.memberof | Get-ADGroup | Select -ExpandProperty Name) -join ";"
} | Select UserName,Groups | Export-Csv D:\Reports\GroupMemberships.csv -NTI

Any help would be appreciated.

Graham MooreAsked:
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I don't see any reason why your original code (second listed above) wouldn't work (there's no actual problem with the code).  Perhaps a timeout was happening if the command was taking a long time to complete.
Try something like the below.  It should perform a lot faster at the expense of increased memory.
$groupHash = @{}
Get-ADGroup -Filter * | ForEach `
Get-ADUser -Filter * -Properties SamAccountName,memberof | ForEach `
  New-Object PSObject -Property @{
      UserName = $_.SamAccountName
      Groups = ($_.memberof | % { $groupHash[$_] }) -join ";"
} | Select UserName,Groups | Export-Csv D:\Reports\GroupMemberships.csv -NTI

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Graham MooreAuthor Commented:
Thanks for your help, that seems to have done the trick!
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