I just installed jEdit 4.3pre16 on a XP windows worksation and now I can not open "large" text files, ~16 meg's. Up to 4.3pre15 I was able to do it. To open a ~16 meg file jEdit 4.3pre15 takes about 40 seconds (not the fastest text editor but once open it is as any other text editor and +), but with pre16 I quit after waiting more than 3 minutes. I noticed on the release notes that they got ridd off of the option -Xms192M. I really do not know if that have something to do with it, and maybe for small files that is not required and speed up the opening of a file, but it appears that it is required for large files. My setup for pre15 is:
C:\WINNT\system32\javaw.exe -Xms64M -Xmx192M -jar "C:\Program Files\jEdit\jedit.jar" -reuseview.
I am using java 5.0_11.