HyperTrie is a hyper optimized C# prefix tree written in Rust. It is currently the fastest C# Trie implementation, about 601% faster than TrieNet.Core 😮💨
Well, I wanted to try optimizing some of the hot paths in one of my libraries Octane Downloader by rewritting them in Rust, but in order to do that, I needed a simpler project to experiment with multi-target builds and including native rust code in a Nuget package. Then I proceeded to optimize the hell out of it for no reason just to see how far I could go. I'm sure there potentially more optimizations to make, like using u8 instead of char for space complexity, so if you see anything feel free to open a PR.
Because of the additional overhead of hashing and collisions. It's faster to just use an array. Although, this leads to poor space complexity due to sparse arrays everywhere, which is why I decided to only support 26 characters.
This is my favorite data structure, and it made perfect sense here since it will never give false negatives. It seemed like the obvious choice to side step hashing and checking if an entry exists in the Trie.
dotnet add package HyperTrieCore --version 1.0.27const string url = "https://raw.githubusercontent.com/dolph/dictionary/master/enable1.txt";
var client = new HttpClient();
var content = client.GetStringAsync(url).Result;
var allWords = content.Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries).Select(x => x.ToLower().Trim()).ToList();
var trieNative = new TrieNative(allWords.Count(), 3);
trieNative.BulkInsert(allWords);Took 505ms to run Trie.Net
Took 84ms to run Trie Native
The benchmark is ran by inserting 172,819 words from the Official Scrabble Player's Dictionary into the Tries and proceeding to check 500 random word occurances.
- No OSX64 support, the Rust code uses GXHash and the Github actions runner does not support the necessary CPU instruction sets :(
- To maximize performance it only supports 26 ASCII characters (A-Z), this is optimal for usecases such as a dictionary or spellcheck applications but not really useful for something like checking available usernames.
The building in VS/Rider is still f***** up, so you will have to use the makefile:
make runMIT License
Copyright (c) 2025 Greg James
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