Works for me using Arduino 0019!
Thank you so much, eried! You've done us all a great favor! Nice work!
Yet another very happy user, thanks a lot!
The fix - It works with Processing too, btw.
I am trying to get a link to this fix included in the
http://www.arduino.cc/en/Guide/Troubleshooting#toc14
.. I hope this will be possible. I remembered seeing this solution long time ago, but I had trouble refinding it.
More links to this genious 
with humble respect
Christian Liljedahl
WOW...
I have same problem.
This is very fantastic solution.
Many thanks!!!
Hey all, i just got my UNO yesterday and noticed the delay on the IDE soft and i can tell that this fix worked for the 0021, too(i had BT com port working on my laptop). thanks!
This helped me a lot!!! Thank you very much!!!
//Arduino UNO - 021 - Win7
gracias por el archivo! ha mejorado la respuesta del programa muy mucho!
thanks for the great job done! I had the same problem in Processing (as they share the same platform) and also solved it.
Luckily I found this thread.
Eried, thank you for this fix; extremely helpful. Turned an almost unusable program into a valuable tool.
works as well with Arduino 022.
Thanks,
Andreas
Hello Mr ERied.
I have the same problem with the slow Arduino IDE. I'm new at this and don't yet know Java. When I look at the Arduino\Lib directory there are only *.jar files. I do not know what to do with your *.rar file. Could you please give more detailed instructions for us Java newbies. Gracias in advance.
Flav
My bad. I downloaded 7-zip to unzip your *rar file and replaced the rxtxSerial.dll iin the Arduino directory.
However, there seems to be no change in the excessive compile time using the arduino IDE. I am using windows 8.1. Any thoughts and suggestions?
Flav
In addition to using Mr. Ried's solution, I had to turn off Spybot's live protection. Now all is well!!
Thank you again Mr. E. Ried!!