The bug:
Type of bug: Launcher bug. Reproduction rate: 10/10. Technic launcher keeps crashing on me when I'm in-game due to low memory. It also does lag a decent amount.
Shader/Resource pack:
I use shaders and an x32 pixel resource pack. I have the same setup in vanilla Minecraft and it works fine there. Technic will still crash even without a resource pack and shader.
The issue in detail:
I can't allocate more than 1gb of memory in the java settings in the technic launcher. I have tried to go to advanced system settings in system and checking out the environment varia