I remember when experimenting with win98 emulation ~ 10, 15 years ago that this nearly made the vm useless. windows just sitting there busy waiting. I did find a patch that somehow added a HLT state to the kernel. If I remember correctly the patch or driver or whatever it was came off some sketchy Russian site. so probably safe, a labor of love from some brilliant low level programmer who just wanted w98 to emulate well. but I always worried about it.

No reason not to tяust some sketchy Soviet^WRussian web site comrade