An i7 should blaze through any DosBox game, definitely configuration related. I have a much older machine (2007 called, they want it back...) but Stunts has no trouble.
I use the plain configuration, with just a few changes:
# fullscreen: Start dosbox directly in fullscreen. (Press ALT-Enter to go back)
# output: What video system to use for output.
# Possible values: surface, overlay, opengl, openglnb, ddraw.
# priority: Priority levels for dosbox. Second entry behind the comma
# is for when dosbox is not focused/minimized. pause is only
# valid for the second entry.
# Possible values: lowest, lower, normal, higher, highest, pause.
# scaler: Scaler used to enlarge/enhance low resolution modes.
# If 'forced' is appended, then the scaler will be used even if
# the result might not be desired.
# Possible values: none, normal2x, normal3x, advmame2x,
# advmame3x, advinterp2x, advinterp3x, hq2x, hq3x, 2xsai,
# super2xsai, supereagle, tv2x, tv3x, rgb2x, rgb3x, scan2x,
# prebuffer: How many milliseconds of data to keep on top of the blocksize.
# cycles: Amount of instructions DOSBox tries to emulate each millisecond.
# Setting this value too high results in sound dropouts and lags.
# Cycles can be set in 3 ways:
# 'auto' tries to guess what a game needs.
# It usually works, but can fail for certain games.
# 'fixed #number' will set a fixed amount of cycles. This is
# what you usually need if 'auto' fails.
# (Example: fixed 4000).
# 'max' will allocate as much cycles as your computer
# is able to handle.
# Possible values: auto, fixed, max.
# cycleup: Amount of cycles to decrease/increase with keycombo.(CTRL-F11/CTRL-F12)
# cycledown: Setting it lower than 100 will be a percentage.
In short: opengl
for faster graphics, pause
the game when I leave the window, larger buffer
makes the sound nicer, and 20000 cycles
so it runs smooth