Virtualbox Screen Resolution Windows 7

I have an issue with NOLF on my pc that i cant seem to find anyone else mention. So im running it on windows 7 64 bit, with an intel integrated graphics card, and for whatever reason, the frame rate of the game drops to single digits whenever im looking at a flashing light, for example: the sparking electricity in the Inge Wagner boss battle. This lag will not be remedied by altering the performance or lowering the resolution, im on an i7 pc, so i know it can handle games from over ten years ago.
Anyone know how i can fix this? I cannot progress pass the inge wagner battle until i fix this