T RANDS Apparently you are unfamiliar with the current state of Java on the desktop. JIT, JRE, other stupid TLAs, etc.

Seriously though, lag? Just 'cause it's Java? That sounds like one of those wacky misconceptions dating back to early Java, much like some people think C++ is always slower than C mostly because some of the earlier C++ compilers sucked horribly.

Okay, I confess; I've never tried jEdit on Windows, only MacOS/X and Linux, but on those two, it runs just great without any particular lag issues or anything.