I linked the source above. The bucket count is a bit highter than 82139... just 101473717 :-P. Changing it with 82139 does make it twice as slow though. I used

I linked the source above. The bucket count is a bit highter than 82139... just 101473717 :-P. Changing it with 82139 does make it twice as slow though. I used 101473717 because that was the number i got from bucket_count() after running it with the default buckets. About hash(x)=x, that is interesting, i never thought to just use x itself as the hash :-P. The performance is actually a tiny bit better (~17%) for checking if a number is in the set.