Yeah, that's slow. If it were faster, that dual action wouldn't be half bad. Seriously, its not much slower than the gas splitter my buddy and I borrow.
It's old. Very old. I think it's arthritic. It is however better than hand splitting. I believe it's a didier. Looks like this. The old Briggs 5hp is tired, and loud as the threads that are in the exhaust port heading to the muffler are stripped out, they think its 50 yrs old, but it still works. I offered to buy it for 200. No dice, and it's not worth more than that either. It looks like this one, but nothing's been replaced, beside gas and oil.