Turning up the Power - Manual Speed Correction
If you are new to Magic DOSBox, then you probably started emulation with the automatic performance settings (this is default settings from the profile
configuration window). Automatic performance is suitable for most games, but it can run some games too fast. In this case, you
need to switch from automatic performance to custom cycles.
Custom Cycles
Emulation means (in very simple terms) executing cycles over time. More cycles means that a program or game will run faster. You can tune cycles
based on your device. Setting cycles too high will lead to sound problems, but the game may run faster. Magic DOSBox starts with 3000 cycles.

If custom cycles are enabled then you can tune performance with "Power" options from the "General Settings" menu. This option is only available when "Custom Cycles" is enabled.