I think it was my computer but I"m not sure. The game was fine until I got to a
certain level and that's when the slow down began. The lag continued to
dramatically get worse until the cave level where it was unplayable: frame by frame super slow down. I decided to beat the level anyway but it took forever and a lot of patience!!!

The game sped up at the castle, however it was still very slow, but not ridiculously slow. I've played many games on MFGG and never experienced slow down like this.

The game itself is well done, but I can't give a high score due to its awful slowdown issues.