In addition values for a 386 class machine:

FDISK uncompressed 72,912 bytes

- started from HD: 1.10s
- started from floppy: 8.74s

FDISK UPX-compressed  39,862 bytes
- started from HD: 1.48s
- started from floppy: 6.59s

So, 386+ class machine combined with slow storage (floppy) -> UPX wins...

> Am 22.07.2026 um 23:36 schrieb Bernd Boeckmann via Freedos-devel 
> <[email protected]>:
> 
> 
> 
>> Am 22.07.2026 um 23:06 schrieb Jim Hall via Freedos-devel 
>> <[email protected]>:
>> 
>> Maybe that's not a big deal for a larger "desktop" app like a
>> spreadsheet or editor or word processor, but is UPX "worth it" for
>> common tools that you run all the time?
> 
> Here are values from an emulated 8088 @ 4.7 MHz where I measured the runtime 
> of a FDISK /info command under FreeDOS kernel 2043 (FAT16-only):
> 
> FDISK uncompressed 72,912 bytes
> 
> - started from HD: 7.75s
> - started from floppy: 15.39s
> 
> FDISK UPX-compressed  39,862 bytes
> -started from HD: 10.77s
> - started from floppy: 16.76s
> 
> So, yes. On slow machines it has a significant performance impact. Should not 
> make much of a difference on 386+ machines I guess...
> 
> Bernd
> 
> 
> 
> 
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