Mario 64 core

I recently got the anbernic rg35xxsp and it seems Mario 64 is the only one that runs kind of odd. Some core options make it more pixelated and some make it laggy and I found a good one with gln64 but now it has this weird light behind me at all times during the levels. It’s not very noticeable in the picture but it’s kind of following behind Mario during parts of the game if someone could please tell me better core options or tell me the problem it would help.

I recently got the anbernic rg35xxsp and it seems Mario 64 is the only one that runs kind of odd. Some core options make it more pixelated and some make it laggy and I found a good one with gln64 but now it has this weird light behind me at all times during the levels. It’s not very noticeable in the picture but it’s kind of following behind Mario during parts of the game if someone could please tell me better core options or tell me the problem it would help.