r/CodePerformance

142 archived posts · Apr 2016 – Jul 2025

Achieving increased code performance

r/CodePerformance

All things related to achieving better performance (whether decreased runtime or resource requirements). Algorithm selection, program optimization techniques (hand vectorization, loop optimization), language performance comparisons, etc are all in scope. Articles on performance, your own code for others to discuss or offer improvements on, etc all welcome. All languages welcome, but there will likely be a focus on lower level languages such as C capable of achieving high levels of performance.

Created Mar 31, 2016 · restricted

2.3KMembers (last snapshot)

142Archived posts

Rules:

Be Civil. Blatant, non-constructive criticism and name-calling will get you banned from this sub.
Top-level comments must directly relate to the submission and not be of "shitpost" quality.

Guidelines:

Reposts of articles is discouraged, and reposting recently posted items is likely to result in deletion of the post at minimum.
All "X is faster than Y" type claims should be supported wherever possible by objective supporting documentation, especially where such claims are broad in nature, such as when discussing one language in reference to another.
All skill levels are welcome, and should be treated as such. This is not the place for help "getting your code to work" though. If your code doesn't work, there are other places to get help. Discussion here is specifically focused on increasing performance.
If posting requesting help increasing performance please clearly state, either in your post title or body which platform you are targeting. EM64T behaves differently than SPARC, ARM, etc. Generally, runtime performance will be the assumed optimization target: if you are focused on memory footprint or something other than runtime, please say so explicitly.
Architectural improvements (swapping one solution component for another, etc) are acceptable for discussion, but the focus is on programming techniques. (See here for more on this.)
If you are programming for a language which has multiple commonly used versions (such as C), please indicate which language standard you are targeting by including it in your post, e.g. "C99" or "C11".
It is okay to include "evil hacks" in recommendations that are not general solutions to problems but very case-specific optimizations. General techniques are to be preferred where viable, but the focus is on pragmatism and performance.
Try not to start flame wars. Remember to keep things civil and fact-based.
This is not intended to be a generic "code review" sub. Please limit your posts to situations specifically related to performance and not "What do you think of my code, in general?".
Submissions related to coding performance contests are acceptable, but should not be grossly commercial in nature. "Compete to win a chance to get a job making $5 an hour programming on the internet" submissions are not welcome.
Code should be formatted as such in posts.

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