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Top 9 C# High Performance Projects
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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Fusion
Build real-time apps (Blazor included) with less than 1% of extra code responsible for real-time updates. Host 10-1000x faster APIs relying on transparent and nearly 100% consistent caching. We call it DREAM, or Distributed REActive Memoization, and it's here to turn real-time on!
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SmartSql
SmartSql = MyBatis in C# + .NET Core+ Cache(Memory | Redis) + R/W Splitting + PropertyChangedTrack +Dynamic Repository + InvokeSync + Diagnostics
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fast-cache
The fastest cache library written in C# for items with set expiration time. Easy to use, thread-safe and light on memory.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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tsunami
A High Performance C# wrapper that allows you to get the benefits of SIMD Intrinsics on List<T>. (by gregyjames)
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Jordium.Snowflake.NET
A high-performance Snowflake ID generator supporting multiple algorithms (drift, traditional, lock-free) for distributed systems.
Project mention: Jordium.Snowflake.NET — A Fast and Lightweight Distributed ID Generator for .NET | dev.to | 2025-11-15Source code, documentation, and examples: https://github.com/nelson820125/Jordium.Snowflake.NET
NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).
C# High Performance discussion
C# High Performance related posts
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Jordium.Snowflake.NET — A Fast and Lightweight Distributed ID Generator for .NET
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Linux desktop app - should I run Blazor inside Electron?
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I want to make a simple enemy health system for a game. Should I create an interface in C# for it?
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People told me to "Just add multiplayer bro", so I spent 3 months adding online multiplayer. Here's what I learned!
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EnumValue<TEnum> and EnumValueCaseIgnored<TEnum> (Open.Text v3.2.3)
- A note from our sponsor - Stream getstream.io | 23 Dec 2025
Index
What are some of the best open-source High Performance projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | ServiceStack | 5,483 |
| 2 | Fusion | 1,888 |
| 3 | SmartSql | 1,126 |
| 4 | FastEnum | 479 |
| 5 | NetStack | 321 |
| 6 | fast-cache | 108 |
| 7 | DynamicGrid | 20 |
| 8 | tsunami | 7 |
| 9 | Jordium.Snowflake.NET | 4 |
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Stream - Scalable APIs for Chat, Feeds, Moderation, & Video.
Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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