最近花了很多時間研究.net性能提升問題，在ms的網站上也找到很多不錯的資料，下面這些內容估計大家或多或少的用過一些，在這里貼出來，希望能對大家的工作有所幫助。

performance tips for all applications：

throw fewer exceptions
make chunky calls
design with valuetypes
use addrange to add groups
trim your working set
use for loops for string iteration—version 1
use stringbuilder for complex string manipulation
precompile windows forms applications
use jagged arrays—version 1
keep io buffer size between 4kb and 8kb
be on the lookout for asynchronous io opportunities

performance tips for asp.net applications

        cache aggressively
        use session state only if you need to
        use view state only if you need to
        avoid sta com
        batch compile
        remove unnecessary http modules
        avoid the autoeventwireup feature
        encode using ascii when you don't need utf
        use the optimal authentication procedure
       

appendix: cost of virtual calls and allocations
call type # calls/sec
valuetype non-virtual call 809971805.600
class non-virtual call 268478412.546
class virtual call 109117738.369
valuetype virtual (obj method) call 3004286.205
valuetype virtual (overridden obj method) call 2917140.844
load type by newing (non-static) 1434.720
load type by newing (virtual methods) 1369.863

more：http://msdn.microsoft.com/library/en-us/dnpag/html/scalenet.asp?frame=true

出處：有氣質的熊(minbear) blog