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From JavaDoc of HashMap :
As a general rule, the default load factor (.75) offers a good
tradeoff between time and space costs. Higher values decrease the
space overhead but increase the lookup cost (reflected in most of the
operations of the HashMap class, including get and put).
If we have a higher value ,why would it increase the lookup cost ?
Hash table’s Load Factor is defined as
High performance of hash table is maintained when the number of collisions is low. When the load factor is high, the number of hash buckets needed to store the same number of entries remains lower, thus increasing the probability of collisions.