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After all the fixes to the Lookup cache, startup with enabled cache is about the same or even slower that without cache. If the cache can't be improved, it may be better to remove it completly. (Note: Lookup cache was performing better in NB3.6, but contained some bugs)
The cache is unlikely to improve. Especially due to fix to bug 44365. Removing the cache is simple change in one line of code in core (or even delete of that code). Somebody just has to decide that it should be done. Waiting for someone to decide by setting to wontfix.
without any additional comment for long time, closing