Depending on the number of objects you're allocating, it's often better (for reduced fragmentation and smooth performance) to use an allocation strategy like GC

Depending on the number of objects you're allocating, it's often better (for reduced fragmentation and smooth performance) to use an allocation strategy like GCC's std::deque: allocate fixed-size buffers, and use an exponentially growing array to hold pointers to those buffers. Once you start getting into millions of elements in your std::vector, you'll see long program pauses (as the vector grows and all the elements are copied to the new vector) and sometimes have difficulty finding a large enough contiguous buffer. This is one reason why the C++ cognoscenti recommend using std::deque as your default array-like container rather than std::vector.