I am in the same situation. I have 8 GBytes of RAM, Intel HD5500 Graphics, and a 2.1GHz CPU. I get approx. 0.2 FPS with tech launcher, and a stable 200 FPS with vanilla MC launcher
I believe it may have something to do with the fact that we are both using Windows 10. I ran every pack I could find on MAC, and they run fine. they also run fine on windows 7/8/8.1, so until Windows 10.1 we might be stuck with the vanilla launcher