We could do the mochiglobal pattern eventually.
But last time I had worried about `ets:lookup` I had measured it at less than 5
microseconds.
Was curious and tried it again my mac laptop:
```
f(Tries), f(T), Tries = lists:seq(1,1000000), {T, ok} = timer:tc(fun() ->
lists:foreach( fun(_) -> config:get_boolean("couchdb", "update_lru_on_read",
false) end, Tries) end), T/1.0e6.
0.955564
```
On a linux server:
```
f(Tries), f(T), Tries = lists:seq(1,1000000), {T, ok} = timer:tc(fun() ->
lists:foreach( fun(_) -> config:get_boolean("couchdb", "update_lru_on_read",
false) end, Tries) end), T/1.0e6.
1.264781
```
Granted neither the laptop not the server were very busy, so maybe with a
larger number of lock acquisitions it looks much worse.
[ Full content available at: https://github.com/apache/couchdb/pull/1593 ]
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