Well, unless you have something running in the background that might be causing DOSBox to slow down at times, I'm at a loss. I have a P4 HT 3.0GHz, and I haven't come across any weird slow down issues with Wing Commander, except when the ships are right up in your face (which is normal). Here's what I have on my config file...
fullscreen=true
fulldouble=false
fullresolution=640x480
windowresolution=original
output=opengl
autolock=true
sensitivity=100
waitonerror=true
priority=higher,normal
mapperfile=mapper.txt
usescancodes=true
language=
machine=vga
captures=capture
memsize=32
frameskip=0
aspect=false
scaler=normal2x
core=normal
cycles=3500
cycleup=500
cycledown=500
nosound=false
rate=22050
blocksize=2048
prebuffer=10
mpu401=intelligent
device=default
config=
sbtype=sb16
sbbase=220
irq=7
dma=1
hdma=5
mixer=true
oplmode=auto
oplrate=22050
gus=true
gusrate=22050
gusbase=240
irq1=5
irq2=5
dma1=3
dma2=3
ultradir=C:\ULTRASND
pcspeaker=true
pcrate=22050
tandy=auto
tandyrate=22050
disney=true
joysticktype=auto
timed=true
autofire=false
swap34=false
buttonwrap=true
serial1=dummy
serial2=dummy
serial3=disabled
serial4=disabled
xms=true
ems=true
umb=true
keyboardlayout=none
ipx=false
loadfix -64
mount f f:\ -t cdrom
mount c c:\DOSGames
mount g e:\ -t cdrom
C:
All I can say is, try setting a copy of your config file to those settings (sans the mounting parts at the end, and possibly putting the core to "dynamic"), and see what happens.
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