If you have some log-files which contains many lines (I mean over 1/2Mb or larger) Yes, It is slow. Causes the "Match Texts", it'll search for your search word in every lines of the log files, So now you know why it takes long time. If you pay attention in what i wrote in the Status "This might take a few minutes" because i knew that, lol :P
But about "How to open the logs from the window" I'll add a browser for it soon...