There are plenty of things that could be used to speed up particular hotspots - arena allocators are one option. Better than that is to not allocate at all, wh

There are plenty of things that could be used to speed up particular hotspots - arena allocators are one option. Better than that is to not allocate at all, which is the focus of the effort here. A step further down the line of optimisation may identify allocation hotspots and use custom allocation strategies rather than using the language default (the heap).