Convert to 0-unsafe code or try Raw API?

[PsiACE]

I noticed that @quininer has implemented a 0-unsafe LinkedHashMap.
See https://github.com/quininer/linkedhashmap . It seems that 0-unsafe has no loss in performance.

I have no prejudice against unsafe, I just think it is a very interesting work.

[PsiACE]

After testing, when the number of allocations is large enough (like 1‹‹22 ) , quininer/linkedhashmap will become very slow ( 4x ) . Is there any other appropriate improvement method?

[PsiACE]

Another possible way to improve is to use the Raw API in hashbrown and griddle, I am not sure whether it can bring a performance improvement, but it is undoubtedly a challenge worth trying.