faster graph response times for cached data

Author: Zacgoose

Modules/CIPPCore/Public/GraphRequests/Get-GraphRequestList.ps1

@@ -80,7 +80,8 @@ function Get-GraphRequestList {
         [string]$ReverseTenantLookupProperty = 'tenantId',
         [boolean]$AsApp = $false,
         [string]$Caller = 'Get-GraphRequestList',
-        [switch]$UseBatchExpand
+        [switch]$UseBatchExpand,
+        [switch]$RawJsonArray
     )
 
     $SingleTenantThreshold = 8000
@@ -423,6 +424,22 @@ function Get-GraphRequestList {
             }
         }
     } else {
+        if ($RawJsonArray.IsPresent) {
+            # Fast path: concatenate raw JSON strings without deserialization. This is much faster and uses less memory when no post-processing is needed, especially for large datasets.
+            $JsonParts = [System.Collections.Generic.List[string]]::new()
+            foreach ($Row in $Rows) {
+                if ($Row.Data) {
+                    $d = $Row.Data.Trim()
+                    if ($d.Length -gt 2 -and $d[0] -eq '[' -and $d[-1] -eq ']') {
+                        $JsonParts.Add($d.Substring(1, $d.Length - 2))
+                    } elseif ($d.Length -gt 0 -and $d -ne '[]') {
+                        $JsonParts.Add($d)
+                    }
+                }
+            }
+            return '[' + ($JsonParts -join ',') + ']'
+        }
+
         foreach ($Row in $Rows) {
             if ($Row.Data) {
                 try {

Modules/CIPPHTTP/Public/Entrypoints/HTTP Functions/CIPP/Core/Invoke-ListGraphRequest.ps1

@@ -122,13 +122,38 @@ function Invoke-ListGraphRequest {
 
     $Metadata = $GraphRequestParams
 
+    # Use raw JSON passthrough for AllTenants cached results when no post-processing is needed.
+    $UseRawJson = $Request.Query.TenantFilter -eq 'AllTenants' -and
+                  -not $Request.Query.ListProperties -and
+                  -not $Request.Query.Sort -and
+                  -not $Request.Query.QueueId
+
     try {
+        if ($UseRawJson) {
+            $GraphRequestParams.RawJsonArray = $true
+        }
         $Results = Get-GraphRequestList @GraphRequestParams
 
         if ($script:LastGraphResponseHeaders) {
             $Metadata.GraphHeaders = $script:LastGraphResponseHeaders
         }
 
+        # RawJsonArray returns a JSON string directly — skip object-level processing
+        if ($UseRawJson -and $Results -is [string] -and $Results.StartsWith('[')) {
+            if ($Request.Headers.'x-ms-coldstart' -eq 1) {
+                $Metadata.ColdStart = $true
+            }
+            $MetadataJson = ConvertTo-Json -InputObject $Metadata -Depth 5 -Compress
+            $GraphRequestData = '{"Results":' + $Results + ',"Metadata":' + $MetadataJson + '}'
+            $StatusCode = [HttpStatusCode]::OK
+
+            return ([HttpResponseContext]@{
+                    StatusCode  = $StatusCode
+                    ContentType = 'application/json'
+                    Body        = $GraphRequestData
+                })
+        }
+
         if ($Results | Where-Object { $_.PSObject.Properties.Name -contains 'nextLink' }) {
             if (![string]::IsNullOrEmpty($Results.nextLink) -and $Request.Query.TenantFilter -ne 'AllTenants') {
                 Write-Host "NextLink: $($Results.nextLink | Where-Object { $_ } | Select-Object -Last 1)"