StablePtr / StableName ?

Dear ghc devs, would the StablePtr performance issue (slow hash table) https://ghc.haskell.org/trac/ghc/ticket/13165 also affect StableNames? Cf. https://github.com/ekmett/ersatz/issues/30 Could making 10^5 stable names, and accessing each just once, take noticeable time? Where would this show up in a profile? I guess there's no easy way to change the ersatz library (StableName this is the fundamental mechanism for detecting sharing) but if these issues are related, then ersatz provides a performance test case. Thanks, Johannes.