Good observation. Yes, this is an optimization: the .NET JIT tends to work more efficiently and optimize code more effectively on smaller methods, and in JIT (rather than NGEN) scenarios startup times can be improved.
As far as we know F# itself has no substantive non-linearities (or at least O(n log(n))) though we don't mega-stress in every way imaginable.
cheers
Don
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Hi
Looking at the IL of a program compiled in Release mode I see that some bigger functions are split into multiple "function @cont" parts. I wonder whether this is meant to be an optimization for the JIT or just a size restriction of the F# optimizer (to protect the user from non-linear complexity, for example). If it is the latter than it might be advantegeous if the compiler pasted the parts together after optimizing them individually. A compiler option controlling the size limit might also be helpful in that instance.
Cheers,
Stephan