Maybe you could try pushing (overclocking) your CPU a bit (MHz by MHz, only a bit) until you find out an acceptable speed.
Try with 4.0.2 and check Vertex Streaming Hack under OpenGL and check if it solves your issue. (You didn´t even mention the build you used, lol).
EDIT: Never mind, just found it on your profile.
Try with 4.0.2 and check Vertex Streaming Hack under OpenGL and check if it solves your issue. (You didn´t even mention the build you used, lol).

EDIT: Never mind, just found it on your profile.
Rig 1: Windows 10 Home | AMD A6-1450 @ 600/1000/1400 MHz | AMD Radeon HD Graphics 8250 | 4GB RAM | HP Pavilion TouchSmart 11.
Rig 2: Windows 10 Pro | Intel Core i7-2640M @ 780/2800/3500 MHz | Intel HD 3000 Mobile | 8GB RAM | Dell Latitude 6320.
