I recently discovered this document in one of FB’s open source libraries for C++: https://github.com/facebook/folly/blob/master/folly/docs/FBVector.md

It makes an interesting argument for growing arrays by a factor smaller than 2 when resizing them so that you can reuse memory more easily. Not sure how much you also need to use a custom malloc routine to get the benefits being claimed, but I thought I'd raise the idea in case we can get any performance enhancements from these ideas.