So I just bought Metal Slug 2 off of the eshop and the slowdown is pretty bad. Didn't bother to do any research before buying it since it didn't even cross my mind that this would be an issue. When there are more than a couple of enemies or projectiles on the screen it just buckles under the load I guess. Idk if the original was like this since I only have Metal Slug X on PSX and Anthology on PSP. Metal Slug 2 runs perfectly on PSP so I know it can be done on Switch. This is just a heads up. I'll update this post if it gets fixed. Pretty disappointing.