Email crashing and taking too long to send an attachment of 500 KB

Well I have a brand new MBP $C i7 2.5 GHz 8GB RAM with clean installed in its 1st week. The email is crashing when I try to send the attachment bigger than 1 MB. It slows down everything when I try to send a normal email and the time it takes to send a simple email is 3 to 5 minutes .
What I have done so far:
Clean install
Change the app to 32-bit run it, quit it, change back to 64-bit and run it. Repeaed many times
Nothing is working out now.
From logs I can see that the mail app is using too much memory and processor while running. Help please

Are you using Transport.send to send each batch? Or are you using a single
Transport object that you connect before the first message and close after
the last message? If you're doing the former, try the latter, it will likely be much
faster.
Also, sendmail may be configured to throttle the rate at which you can send
messages; you might want to check with a sendmail expert on that.

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    --mark                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

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