[racket] Typed Racket startup time

In a blank #lang racket buffer, if I hit F5, I get a repl cursor almost
instantaneously. If I do the same in typed/racket, it takes roughly three
seconds every time. This can't be blamed on parse time since the buffer is
empty! What gives? (And Sam, do you regard this as a ux bug?)

--
Pardon terseness and mistakes -- sent from phone.
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