Sure. Incomplete or inaccurate emulation can have various impacts on how a game plays (slowdowns, graphical issues, sound issues). Anything really.
I just tried Aqua Jet and have the same exact slowdowns. My PC is a 3.8 Ghz CPU. It's quite possible that the driver is that demanding and a higher end PC is required to get those games to reach 100% FPS.
Also, keep in mind, a general rule of thumb on this board is not to report problems with games that have driver issues. You can certainly ask questions but have an asbestos suit on standby.
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