Hi

We run the same trouble with uv phantom started from a windows ScheduledTask.

By default, windows schedule task runs with minor priority. 

You can change it by exporting it as xml, update the priority then reload the SchedukedTask.

I hope this help

Barry,

To add on to Manu's comment, if you are using Linux on the backend, check out the nice & renice commands to set priority for your phantom process. 

Regards,

Mark

Could it be a disk cache loading behavior with an empty cache after booting? Running at a lower priority, it may take extended elapsed time to bring the file into the disk cache.

As an experiment, try SELECTing the file at a command prompt first. 

here is the doc TaskSettings.Priority property - Win32 apps | Microsoft Learn 

a little pwsh to do it 

$mytask = "mytask"
$t = Get-ScheduledTask -Taskname "$mytask"
$t.Settings.Priority   # show the current value 
7
$t.Settings.Priority = 4     # set the new value
Set-ScheduledTask -taskname "$mytask" -Settings $t.Settings   # update the task 

I attach a complete function, use it  :

Set-InPsScheduledTaskSettingsPriority -Taskname mytask -Priority 4 -verbose

I hope this help