How fast can a orangutan swing?

At speeds of up to 25-30 mph depending on location , gradient etc

however usually they are slow because they have a mental map of the forest , unlike say a gibbon who is far faster but does not share this mental power.

so to sum it up about 12-16 mph slow swing

16-24 fast

any over 24 sprint

But even though the orangutan is indeed very strong and has great stamina , its just not practical to swing at max speed all day