Version: 1.3 Beta (using KDE Devel) Installed from: Compiled sources Compiler: gcc 3.2 OS: Linux If you run for ((a=0;a<$(($LINES*$COLUMNS/2));++a)); do echo -ne '\033[04m-\033[00m-'; done in a Bash shell in a Konsole session, the result will render slowly. I have created a patch for this, which I will add after I've opened the bug.
Created attachment 4153 [details] Patch fixing the problem described in the bug
I don't experience any more slowdown than non-underlined.
Can't reproduce the slowdown, but the patch is correct and I assume the clipping can indeed be slow. Will commit.