Ctrl-F11/ctrl-f12 will speed up or slow down clock cycles in DOSBox. However, it's recommended you do this BEFORE you run the game or it might cause some funny problems.
The other option is to open up DOSBox.conf in notepad and manually edit the value under CPU. It is recommended that you make an unaltered copy of your DOSBox.conf before diddling with the values or you may not remember them later.
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