The Dash 200 can keep just under barber pole (242) until about 8 miles and still be stable at 500 without using the props as speedbrakes, but it takes some work. 210 to the marker is fine. The 300 takes a bit more, especially when heavy, but flaps 5 and Vlo are higher, so you can use that. Pushing the props forward to 1200rpm and horsing the plane around gives you more options, but it's not a great ride for the pax.
But echoing the other turboprop guys, we have no problem slowing down or making room. I really wish Potomac would use our ability to squeeze into traffic holes more often rather than 22 mile finals. I mean, we all like extra money but sometimes I'd rather get on the ground. New York does a better job, but I wish we could use 11/29 in EWR more often.
I cringe (and always feel I should "query ATC") when I controller asks us to slow to final. A new controller asked us to do that once 10 miles out from IAD on a windy day. Ref+10 was 115 or so, we had a 90 kt groundspeed. We asked her to confirm and she was adamant. I felt bad for the Citation that had to go around behind us.
There's an adage that car enthusiasts use: " It's more fun to drive a slow car fast than a fast car slow"