msvc v7.1 to v9 performance issues

[ameyav]

I have migrated a c++ project from msvc 7.1 using boost 1.32 to msvc 9 using boost 1.38.

I have however noticed that the binary compiled under msvc 9 is almost 25% slower than the one compiled under msvc 7.1

The migration wizard in Visual Studio .NET 2008 did the needful, so i have not manually changed any project settings.

Any suggestions or tweaks will be really helpful.

Thanks in advance!

[weaknessforcats]

Is this slowdown for a debug or release build?

Windows program? Set for lean and mean?

If it's debug, the current debugger is much niftier than the older one. That could translate into a slowdown.

[ameyav]

This is for release build.

The "/O2" compiler option was turned on in both the compiler versions[in bold], but the performance difference still persists.

[weaknessforcats]

Have you tried using Boost 1.32 with VC9? Maybe the problem is in the Boost library.