# Allocation and slow down when # of types involved increase (slower than C++ virtual methods)

**URL:** <https://discourse.julialang.org/t/allocation-and-slow-down-when-of-types-involved-increase-slower-than-c-virtual-methods/87656>\
**Category:** Performance\
**Tags:** question, hep\
**Created:** [September 22, 2022, 3:43pm UTC](https://discourse.julialang.org/t/allocation-and-slow-down-when-of-types-involved-increase-slower-than-c-virtual-methods/87656 "2022-09-22T15:43:34Z")\
**Posts on this page:** 1\
**Showing post:** 38

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**Author:** ![CameronBieganek](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/cameronbieganek/32/6915_2.png) [@CameronBieganek](https://discourse.julialang.org/u/CameronBieganek)\
**Post date:** [September 24, 2022, 12:07am UTC](https://discourse.julialang.org/t/allocation-and-slow-down-when-of-types-involved-increase-slower-than-c-virtual-methods/87656/38 "2022-09-24T00:07:27Z")

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> [@jling](#):
>
> the function we call inside the loop is recursive

Purely anecdotal information here, but one time I wrote a recursive function, and it was slow. I rewrote the function using a `while` loop, and it was fast. 🙂

So, perhaps your real issue here is using recursion.

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