A potential replacement for Get-PlaybackInfo which in limited testing is 249% faster by using a SequenceDataSource instead of a RawDataSource.

Get-PlaybackInfo2.ps1

function Get-PlaybackInfo2 {
    [CmdletBinding()]
    param (
        # Accepts a Milestone Configuration Item path string like Camera[A64740CF-5511-4957-9356-2922A25FF752]
        [Parameter(Mandatory, ValueFromPipeline, ValueFromPipelineByPropertyName, ParameterSetName = 'FromPath')]
        [ValidateScript( {
                if ($_ -notmatch '^(?<ItemType>\w+)\[(?<Id>[a-fA-F0-9\-]{36})\]$') {
                    throw "$_ does not a valid Milestone Configuration API Item path"
                }
                if ($Matches.ItemType -notin @('Camera', 'Microphone', 'Speaker', 'Metadata')) {
                    throw "$_ represents an item of type '$($Matches.ItemType)'. Only camera, microphone, speaker, or metadata item types are allowed."
                }
                return $true
            })]
        [string]
        $Path,

        # Accepts a Camera, Microphone, Speaker, or Metadata object
        [Parameter(Mandatory, ValueFromPipeline, ParameterSetName = 'FromDevice')]
        [VideoOS.Platform.ConfigurationItems.IConfigurationItem]
        $Device,

        [Parameter()]
        [string]
        $SequenceType = 'RecordingSequence'
    )

    begin {
        $site = Get-Site -ErrorAction Stop
        $epoch = [datetime]::SpecifyKind([datetimeoffset]::FromUnixTimeSeconds(0).DateTime, [datetimekind]::utc)
    }

    process {
        if ($PSCmdlet.ParameterSetName -eq 'FromDevice') {
            $Path = $Device.Path
        }

        if ($Path -notmatch '^(?<ItemType>\w+)\[(?<Id>[a-fA-F0-9\-]{36})\]$') {
            Write-Error "Path '$Path' is not a valid Milestone Configuration API item path."
            return
        }
        try {
            $item = [videoos.platform.Configuration]::Instance.GetItem($site.FQID.ServerId, $Matches.Id, [VideoOS.Platform.Kind]::($Matches.ItemType))
            $sds = [VideoOS.Platform.Data.SequenceDataSource]::new($item)
            $sequenceTypeGuid = [VideoOS.Platform.Data.DataType+SequenceTypeGuids]::$SequenceType
            $first = $sds.GetData($epoch, [timespan]::zero, 0, ([datetime]::utcnow - $epoch), 1, $sequenceTypeGuid) | Select-Object -First 1
            $last = $sds.GetData([datetime]::utcnow, ([datetime]::utcnow - $epoch), 1, [timespan]::zero, 0, $sequenceTypeGuid) | Select-Object -First 1
            if ($first.EventSequence -and $last.EventSequence) {
                [PSCustomObject]@{
                    Begin = $first.EventSequence.StartDateTime
                    End   = $last.EventSequence.EndDateTime
                }
            }
            else {
                Write-Warning "No $SequenceType sequences found for $($item.Name) ($($item.FQID.ObjectId))"
            }
        } finally {
            if ($sds) {
                $sds.Close()
            }
        }
    }
}

Register-ArgumentCompleter -CommandName Get-PlaybackInfo2 -ParameterName SequenceType -ScriptBlock {
    param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameters)

    [VideoOS.Platform.Data.DataType+SequenceTypeGuids] | Get-Member -Static -MemberType Property | Select-Object -ExpandProperty Name | Where-Object {
        $_ -like "$wordToComplete*"
    } | ForEach-Object {
        "'$_'"
    }
}