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Message: [QUOTE="dizzy, post: 3422946"] "6.18 Runtime type identification (RTTI) Runtime type identification adds extra information to all class objects and is not efficient. If the compiler has an option for RTTI then turn it off and use alternative implementations." I would say "LOL" but this is not IRC (it doesn't say if it is less efficient than something that does the same thing, it doesn't say if one should disable RTTI only when not using and when paying for it's price is too much, etc it just makes generic statements like that). It seems to me to be more addressed to people that already know how to optimize something and as such put all those generic statements in the proper context. A better reference IMO would be the C++ performance technical report: [URL]http://www.open-std.org/JTC1/SC22/WG21/docs/TR18015.pdf[/URL] [/QUOTE]