最近花了很多时间研究.net性能提升问题，在ms的网站上也找到很多不错的资料，下面这些内容估计大家或多或少的用过一些，在这里贴出来，希望能对大家的工作有所帮助。

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[来源 www.iocblog.net]

        cache aggressively
        use session state only if you need to
        use view state only if you need to[来源 www.iocblog.net]
        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

出处：有气质的熊(minbear) blog