posting to improve other gold comment with taskset tweak. to avoid doing manual work, set incantation between square brackets as launch options(mask is hardcoded first 16 cores, but it is anyway better than just one cpu of original): [ ( while ! pidof JadeEmpire.exe; do sleep 1; done; sleep 1; taskset -p ffff $(pidof JadeEmpire.exe) ) & %command% ]

. game works fine, but limited to 30 fps, which is pretty low for such an old game