Actually, SVN is a little slower. That’s not a Magic Dosbox issue in particular, but some of the recent changes to the Dosbox caused this. Even on Windows/Linux, though it’s not really noticeable on desktop cpus.
For speedup, try using cycles=110%, or cycles=120% (that’s the limit, I think). And on weaker phones, set prebuffer=0. That helped on my old Note 4 (Snapdragon) at least, while it didn’t make a difference on my newer phones (S7 edge, S9+, both Exynos).
Very nice layout btw, I like the design of your keys. ?