CMD Batch per Taskplaner langsamer als manuell gestartet

Right click on the task and "export" it  
Edit the task.xml file that you just exported
You will find a line similar to <Priority>7</Priority>
Change the value to a normal priority (between 4-6). A table of the potential values: TaskSettings.Priority property
A value of 4 will have the same I/O and memory priority as an interactive process. Values of 5 and 6 will have lower memory priority
In the task scheduler, delete the task you initially created
In the task scheduler, in the actions area, import the task from the XML file

$task = Get-ScheduledTask -TaskName '...' // Your task's name  
$settings = $task.Settings
$settings.Priority = 4
// For possible values see https://learn.microsoft.com/en-us/windows/win32/taskschd/tasksettings-priority#remarks
Set-ScheduledTask -TaskName $taskName -Settings $settings