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What makes the Dosbox CPU so fast?

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First post, by superfury

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I'm simply comparing my emulator (x86EMU) to Dosbox. When I look at Dosbox results from MIPS 1.10 on my Intel i7 64-bit(Windows 10)@4.0GHz, MIPS 1.10 gives me a performance result of 12.29MIPS(core set to normal to use comparable emulation), while my own emulator runs at 1.91(with mouse&keyboard unmounted, about 1.04 when mounted(probably because of SDL events slowing things down?)). They should both be running the CPU using a interpretation core? How come Dosbox is so much faster than my own emulator?

My source code of my emulator is at:
https://bitbucket.org/superfury/x86emu.git

Author of the UniPCemu emulator.
UniPCemu Git repository
UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

Reply 2 of 3, by Kerr Avon

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I'm disappointed that no one has answered this question, as I too would be interested to learn how DOSBox is so fast. Granted I wouldn't understand a lot of it, but it would be interesting to read.

Can anyone explain it, please?

Reply 3 of 3, by Interlace

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Ditto here, my guess is since the main goal and focus from the start was not just emulation, but getting every dos game running, there's a lot of cheating and cycle stealing going on, in the good way 😉

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