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Dot Net CLR Performance considerations while Architecting

Performance considerations while architecting dot net applications.
  1. Throwing Few Exceptions : 
    • Avoid exceptions with in loops.
    • Minimal use of functions like Response.Redirect() which throws a ThreadAbort exception.
    • COM usage could result in HRESULTS exception, make sure to track these.
    • Usages of ValueTypes where ever possible, rather using Reference types that is classes. Avoiding boxing and un-boxing for best use of memory.
    • Reduce interaction with unmanaged code. COM interop is much more expensive.The following steps needs to be taken while interacting with unmanaged code.
      • Data Marshalling
      • fix calling convention
      • Protect callee-saved registeres
      • Switch thread mode so that GC won't block unmanaged threads
      • Erect an Exception Handling frame on calls into managed code
      • Handle threading properly
    • Use For loop for string iteration. For loop on strings is five times faster than Foreach.
    • StringBuilder for complex string manipulation increases performance.
    • System.IO buffer size could be between 4KB and 8KB for best performance
    • Asynchronous IO when applied correctly, it gives as much as ten times the performance.

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