Folding bikes are not intended for regular commuting of distances exceeding 5 miles at a time. They are well-suited for convenient transportation by easily fitting into the trunk or back seat of a car. They can be used in parks or tourist spots as a short-distance alternative to walking.

Anyway, if your goal is to improve the speed of the folding bike, you may consider replacing the stock folding pedals with wider pedals (eg., Crankbrothers pedals, or some other brand wider pedals). The upside of replacing with wider pedals is that they will increase the speed of your folding bike. The downside is that the wider pedals are not foldable, if you can compromise on that.