Hello, sorry for my bad english, i had the same problem as a lot of people had here of dealing with a very poorly optimized game that has a lot of stutters and very low fps, i have Win 11, Ryzen 5700X3D and 4070 Super, 16 GB Ram, and i wont get past 20 fps in Reforged mode, making it completely unplayable for me.
The thing i did was following this video youtube guide https://www.youtube.com/watch?v=iBiNfa32AnE of this guy that explains how to optimize your pc, i did every step of this guide and after restarting my pc and logging in wc3 the fps increased from 20 fps average to 160-180 an increase of over 700%, also the stuttering disappeared
Of course this guide is not a definitive solution you can follow, the perfomance varies from user to user, depending of the components and the configuration, im posting this because i hope it helps somebody who is having its game unplayable and tryed a lot of things to make it be more faster and didn’t work.