Users of the newly released Remote Desktop Manager 9.0 will notice that there's now a 64-bit version installed alongside the 32-bit version. Upon running this 64-bit version, you'll notice how much slower it is than the 32-bit version. I posted it on the Devolutions forum and got this reply, designating it as a known issue with 64-bit .NET.

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Hi,
Unfortunately this is known issue with .NET 64.

http://stackoverflow.com/questions/12979774/net-4-0-app-slower-on-64-bit-than-32-bit-profiling-and-possible-solutions-ap

By the way we recommend to use the 32 bit version of RDM ans switch to the 64 version only if you get some memory limitation. We have more technology  ...