Hmmm I have LimeWire Pro 4.4.5 and JRE 1.5.0_01.

It seems to work well. I'm normally turbo charged although on a few occasions it has dropped to excelent. I wrote that off to what I was doing on the comp. at the time and possible internet congestion.

As stief said the differences are not easily noticed. I have noticed a few a differences in other areas of the program that I personally like.

And I for one don't mind donating to the developement of new LimeWire versions whether they be the free or pro version.

And finally have you read or searched any of the threads for optimizing LimeWire performance.

Just my opinion (some stink some don't)