A former employee mentioned in a comment that Fermyon, a cloud platform company focused on solving cold start issues with WebAssembly, was acquired by Akamai.

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    "summary": "A former employee mentioned in a comment that Fermyon, a cloud platform company focused on solving cold start issues with WebAssembly, was acquired by Akamai.",
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    "comments": [
      {
        "url": "https://www.reddit.com/r/dotnet/comments/1wjo1em/comment/pakfpzt/",
        "depth": 0,
        "score": 33,
        "author": "Tavi2k",
        "excerpt": "By not having ephemeral .NET applications for the most part.\n\n It's slightly annoying for running an application as a CLI tool, but that's a minor use case for me and we can live with the delay.\n\n Running on something like AWS Lambda is probably the biggest use case where this matters. But personally I'd just not run stuff there that cares about cold start performance much, if I can help it. And i",
        "posted_at": "2026-09-18T13:18:31.000Z",
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        "url": "https://www.reddit.com/r/dotnet/comments/1wjo1em/comment/paka551/",
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        "author": "mistertom2u",
        "excerpt": "I will also share my experience. I work for a large software company that makes HCM SaaS product. The cold start performance of .net for AWS lambdas became such a significant issue that we are writing lambdas in Python.\n\n We were told that because NativeAOT lacks full observability functionality, and because DataDog, which uses IL weaving, still doesn't support AOT, that using AOT is a \"non-starte",
        "posted_at": "2026-09-18T12:50:47.000Z",
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      {
        "url": "https://www.reddit.com/r/dotnet/comments/1wjo1em/comment/pak4xqt/",
        "depth": 0,
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        "author": "DaveVdE",
        "excerpt": "If only we could have AOT compilation without throwing the JIT away. NGEN used to be a thing to speed up larger applications and improve the user experience.\n\n NativeAOT feels much like the early versions of .NET Core: throw away most of the existing APIs to make something lean and mean, but lose a lot of functionality in the process.\n\n Hopefully we’ll come to our senses and have something in the",
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        "depth": 0,
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        "author": "faculty_for_failure",
        "excerpt": "If it’s on the critical path we use Go. .NET is 99% of all code at my workplace, but we do have Go in the 1% where cold starts are not acceptable. AoT may also be a good option, though.",
        "posted_at": "2026-09-18T14:32:50.000Z",
        "author_url": "https://www.reddit.com/user/faculty_for_failure/"
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      {
        "url": "https://www.reddit.com/r/dotnet/comments/1wjo1em/comment/pakrdz4/",
        "depth": 0,
        "score": 4,
        "author": "aj0413",
        "excerpt": "You’re trying to fit round peg into square hole\n\n Dotnet just isn’t the right tool for lambda jobs that need to be fast",
        "posted_at": "2026-09-18T14:12:48.000Z",
        "author_url": "https://www.reddit.com/user/aj0413/"
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        "url": "https://www.reddit.com/r/dotnet/comments/1wjo1em/comment/pamvuiv/",
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        "author": "soundman32",
        "excerpt": "Ive had a C# AOT lambda cold start, read a db, and post a message on a sms in about 20ms.  Obviously its not EF or DI but for a quick lambda you wouldnt do that, would you.",
        "posted_at": "2026-09-18T19:42:44.000Z",
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        "author": "zionsati",
        "excerpt": "I'm actually working on an alternate .net compiler that is fully AOT only targeting wasm which means it can be compiled straight to exe.\n\n Early days though, not going to be able to handle aspnetcore unless Microsoft writes a source generated version of it.\n\n The compiler and alt corelib intentionally does not do reflection. Also missing multithreading support at the moment but that is on the road",
        "posted_at": "2026-09-19T06:58:29.000Z",
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        "author": "FragmentedHeap",
        "excerpt": "Rule 1, nothing in hot path that can be avoided. I.e dont wire in app configuration or keybault or other webservices that have to be hit in app start.\n\n .net applications that run in containers that need to start fast have to be optimized to do so not just from how they're configured or how they're compiled but how they're built.\n\n For example if you really need app configuration from azure, you d",
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    "evidence": [
      "[comment u/pfluggs11] Fermyon, a company I worked at previously, built a whole cloud platform to solve this problem. Eventually they were acquired by Akamai but Spin Framework is open source and Spinkube is a CNCF project."
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    "post_text": "I am curious what people are seeing in production with .NET cold start, especially for workloads where containers are expected to come up quickly and may not live very long.\n\nI am less interested in synthetic hello-world numbers and more interested in actual services with DI, configuration, logging, authentication, Minimal APIs or MVC, JSON serialization, database clients, telemetry, etc.\n\nFor those running regular CoreCLR, what combination of things got startup into an acceptable range?\n\nFor example:\n\nReadyToRun\n\nComposite ReadyToRun\n\nTiered compilation / Quick JIT settings\n\nStartup warmup\n\nPreloading specific code paths\n\nProfileOptimization / multicore JIT\n\nReducing reflection or moving work to source generators\n\nKubernetes startup/readiness probe tuning\n\nKeeping minimum replicas around\n\nAnything else that made a measurable difference\n\nWhat kind of cold-start numbers did you start with, and what did you get them down to?\n\nI am also especially interested in people who actually deployed NativeAOT for a nontrivial service.\n\nNativeAOT obviously attacks cold start much more directly, but once you leave small Minimal API examples there are some real tradeoffs. MVC is out, dynamic/reflection-heavy libraries can become a problem, some libraries need changes for trimming/AOT, and the diagnostics/observability story is different from normal CoreCLR.\n\nIf you are using NativeAOT in...",
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    "post_title": "How are you guys dealing with .NET cold start in ephemeral containers?",
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