ESC/Label: SpeedUp through less delete operations (Z#23124315)

[pc-coholic]

Please test through experimentation:

• Does removing the first delete statement increase print speed?
• Does deleting only one specific file instead of everything in volatile memory speed up the printing of a follow-up job?

Further experimentation could be: Do we even need to delete the volatile memory? Aka: Can it even overflow?
For that, it might be easiest to either pump a bunch of files into the memory through the Windows Print Driver/Settings app.

Also: Disabling sleep mode should be tried (if not already done)