What CPU exactly do you have? Especially for Minecraft it could help to install the newest driver. VRAM has nothing to do with your performance observation. It looks fine in your control panel. 128 MB is the shared memory size for the iGPU, it doesn't necessarily mean that your iGPU has to use it all the time. In most cases your iGPU just doesn't need 128 MB, at least not in a typical office environment. In a game it might need more VRAM. It's more the oppositte you should increase the shared RAM size in Bios. With Intels Dynamic Video Memory Technology (DVMT) enabled it doesn't matter at all though.