diff --git a/PoshRSJob/Public/Get-RSJob.ps1 b/PoshRSJob/Public/Get-RSJob.ps1
index 24b6ecb..286bf93 100644
--- a/PoshRSJob/Public/Get-RSJob.ps1
+++ b/PoshRSJob/Public/Get-RSJob.ps1
@@ -102,7 +102,7 @@ Function Get-RSJob {
             $DebugPreference = 'Continue'
         }
         Write-Debug "ParameterSet: $($PSCmdlet.parametersetname)"
-        $Hash = @{}
+        $SearchProps = New-Object System.Collections.ArrayList
         $ResultJobs = New-Object System.Collections.ArrayList
     }
     Process {
@@ -112,14 +112,12 @@ Function Get-RSJob {
         if ($PSCmdlet.ParameterSetName -eq 'Job') {
             Write-Verbose "Adding Job $($PSBoundParameters[$Property].Id)"
             foreach ($v in $PSBoundParameters[$Property]) {
-                $Hash.Add($v.ID,1)
+               [void]$SearchProps.Add($v.ID)
             }
         }
         elseif ($PSCmdlet.ParameterSetName -ne 'All') {
             Write-Verbose "Adding $($PSBoundParameters[$Property])"
-            foreach ($v in $PSBoundParameters[$Property]) {
-                $Hash.Add($v,1)
-            }
+            $SearchProps.AddRange($PSBoundParameters[$Property])
         }
     }
     End {
@@ -127,27 +125,37 @@ Function Get-RSJob {
         if ($Property -eq 'Job') { $Property = 'ID' }
         $States = if ($PSBoundParameters.ContainsKey('State')) { '^' + ($State -join '$|^') + '$' } else { '.' }
 
+        [System.Threading.Monitor]::Enter($PoshRS_jobs.syncroot)
+        try {
         # IF faster than any scriptblocks
-        if ($PSCmdlet.ParameterSetName -eq 'All') {
-            Write-Verbose 'All Jobs'
-            $ResultJobs = $PoshRS_Jobs
-        }
-        else {
-            Write-Verbose "Filtered Jobs by $Property"
-            foreach ($job in $PoshRS_Jobs) {
-                if ($Hash.ContainsKey($job.$Property))
+            if ($Property -eq 'All') {
+                Write-Verbose "Get all Jobs"
+                $ResultJobs = $PoshRS_Jobs
+            }
+            else {
+                Write-Verbose "Jobs by $Property"
+                # And Hash much faster than foreach{ foreach {} } inner loop
+                $Hash = @{}
+                foreach ($jobobj in $PoshRS_Jobs) {
+                    $Hash[$jobobj.$Property] = $jobobj
+                }
+                foreach ($prop in $SearchProps) {
+                    if ($Hash.Contains($prop)) {
+                        [void]$ResultJobs.Add($Hash[$prop])
+                    }
+                }
+            }
+            foreach ($job in $ResultJobs) {
+                if (($job.State -match $States) -and
+                    (-not $PSBoundParameters.ContainsKey('HasMoreData') -or $job.HasMoreData -eq $HasMoreData)
+                   )
                 {
-                    [void]$ResultJobs.Add($job)
+                    $job
                 }
             }
         }
-        foreach ($job in $ResultJobs) {
-            if (($job.State -match $States) -and
-                (-not $PSBoundParameters.ContainsKey('HasMoreData') -or $job.HasMoreData -eq $HasMoreData)
-               )
-            {
-                $job
-            }
+        finally {
+            [System.Threading.Monitor]::Exit($PoshRS_jobs.syncroot)
         }
     }
 }