One of the main drawbacks of using a hash table is that it does not preserve the order of the data, which means you cannot traverse the table in a sequential or sorted way, or find the minimum or maximum element. This can be problematic for applications that require order-based operations, such as sorting, range queries, or rank calculations. To overcome this, you can use a hash table in combination with another data structure, such as a linked list or a BST, which can store the order of the data. However, this can also increase the complexity and space of the implementation. Another drawback of using a hash table is that it can suffer from collisions, which are situations where two different keys have the same index. This can reduce the performance of the operations to O(n) time, where n is the number of elements in the table. To avoid this, you can use a good hash function that minimizes the chances of collisions, and a collision resolution technique that handles them efficiently. However, this can also depend on the size and distribution of the data.