If you are looking for the decompiler itself, visit https://github.com/jindrapetrik/jpexs-decompiler
NEW : We have got a new blog where we post some interesting SWF internals info.List of issues
#1661 Slow Rendering
Labels: Flash Viewer
Anytime i use a swf it gives me a slow rendering error
It's only WARNING (not an ERRROR) telling you that our Flash Viewer is not fast enough - usually on complex SWFs this is displayed. You should not worry about.
Okay, I made the warning by default turned off, it can be turned back on in settings. Use nightly version 1892.