VDM does not execute code natively when it's possible: use VM86 on IA32 or VT-X/AMD-V on IA64

At the time of writing, ReactOS uses a CPU emulator for executing DOS code, for both 16 bit and 32 bit. It would be better to switch in V86 and execute the code natively when running on IA32, or use VT-X or AMD-V when running on IA64. This will apply also when executing WIN16 code.
The usage of the software emulation should be used when it it not possible to do so, like when it runs on a different CPU like ARM.