public key authentication performance using putty

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Hello list,
when i try to use putty with large keys (8kb) then authentication
process takes a loooong time. During this time, putty loads one cpu
core to 100%. If I try the same thing with the same key on the same
host connecting to the same server using cygwin/ssh its done pretty
much faster. So think this is not a dns issue. I googled around for
the issue and found the following post about my problem:

But the thread doasn't contain a solution. Is this just a putty
performance issue or am I doing something wrong?

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