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    <p>Unfortunately there isn't much you can do -- the F# compiler is just slower than the C# compiler. But let me explain why:</p> <p><strong>Why the F# compiler is slower than the C# compiler</strong></p> <p>First, the F# compiler is written on .NET, the C# compiler is written in C++. While this alone isn't a death sentence to perf, it does make a difference. Second, the C# compiler is 10+ years old. There has been a <em>lot</em> of time to tune and optimize it -- both the compiler itself and the .NET runtime. The .NET JIT engine has been fine-tuned for C#/VB.NET and not F#. Functional programming requires a lot of short-lived objects, which translates to different type of GC behavior.</p> <p>But the real reason why the F# compiler is noticeably slower than the C# compiler is because it is doing <em>more work</em> than the C# compiler. In C# you provide all of the type information, which in a way is you doing work for the compiler. F# on the other hand does type inference for you, which while saving you from the burden of annotation does require additional CPU time.</p> <p><strong>What you can do</strong></p> <p>I recommend you download the Visual Studio 2008 shell and use F# targeting the .NET Framework 2.0. Unless you need something that is in Visual Studio 2010 or CLR 4.0 only, you will be fine on Visual Studio 2008. The F# language functions the exact same. The only difference, IIRC, is in what types certain things compile to. For example, there is a Tuple&lt;_> type built into CLR 4.0, but when targeting CLR 2.0 the tuple type defined in FSharp.Core.dll is used.</p> <p>Visual Studio 2010 offers a lot of slick bells and whistles, such as a WPF-based code editor. However, those niceties consume a lot of RAM and in your case it sounds like you can live without them.</p>
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    1. COhi, Thanks for answering. I'm downloading the VS2008 shell and F# for .net 2 and i'll see if things improve. In case it doesn't, I think i'll put off trying to learn F# for 3 months, since i'll be getting a 4 Gb ram, i5 powered laptop by then and hopefully the compile time'll get reduced. I'll leave the question open for now, just in case someone comes up with a solution or better alternative.
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    2. COI installed vs2008 and there's been no improvement in the compile speed. I'll have to wait a while, I guess :)
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    3. COhi, I unaccepted your answer and accepted Stephan Tolksdorf's, because his suggestions worked. Hope you don't mind.
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