The latest downloadable core now as overclocking and sprite limit removal options. Though it is recommended for now to leave the clock set to 100% and the sprite removal to off and to only adjust those settings on a per-game basis and per game override for games that benefit it. Certain games may run into issues, one such issue is the title screen of Sonic the Hedgehog, notice his body showing over top of the Sonic banner. Master System games will certainly benefit more from these features than the Genesis.