I understand that but it was running poorly on OpenGL with the stable build, and the fact that there is so much of a difference between 2x to 2.5x IR suggests there's maybe more to this issue.
New: Dell Inspiron 15 7580 | Intel i7-8565U @ 1.8 GHz | 16 GB DDR4 RAM | GeForce MX150 2 GB
Old: Lenovo IdeaPad Z510 | Intel i7-4702MQ @ 2.2 GHz | 6 GB DDR3 RAM | GeForce GT 740M 1 GB
Old: Lenovo IdeaPad Z510 | Intel i7-4702MQ @ 2.2 GHz | 6 GB DDR3 RAM | GeForce GT 740M 1 GB