try core=dynamic.

But as it's an emulator there is always a speedloss. I'm supprised it's only a factor 6

this is my configuration.

core=dynamic
cycles=30000
cycleup=1000
cycledown=1000

if i try replace 30000 by 50000 the software is more slowly.
if i try replace 30000 by 10000 the software is more slowly.

try
core=dynamic
cycles=auto
frameskip=9
nosound=true

and be sure to use DOSBox 0.65

can you use msn for help me ?

when i use cycles=auto my software wouldn't start calculation but run correctly
when i use cycles=30000 my software calculate and run correctly.

You can try to start your program with command.com instead of cmd.exe; it's still there in %windir%\system32.

The command.com with my sotfware are incompatible

in fact, the incompatibility is only about the video driver.

> when i use cycles=auto my software wouldn't start calculation but run correctly

So how does it run correctly if it doesn't even start???

And what pc (cpu, memory etc.) do you have?

Penthium 4 3.2Ghz Hyper threading 1Go RD RAM
160 Go Hard drive
nvidia Fx540
intel chipset

the soft run, i can choose parameters but calculation wouldn't run and my software exit calculation process.

Tried core=dynamic with different cycle settings, as
well as core=normal with cycles=auto?

I try :
Dynamic with
6000 : too long
15000 : faster but too long
25000 : the best value but too long
40000 : slower
100000 : slower
500000 : slower
1000000 : slower
auto : soft start but calculating process cannot run

Normal :
25000 : soft start but calculating process cannot run
Auto : Calculating erreur with sqrt

Dunno about the sqrt, but "too long" is relative when
keeping in mind that you're using a full-blown pc emulator.