This is something I've noticed for awhile now and I've been hoping it would get better with newer releases. I do quite a bit of plain-text file editing (actually markdown, but I open it as plain text since there's no markdown hilighting support). After having a plain text file open for awhile, the editor becomes increasingly slow. After editing a file for maybe 20-30 minutes, the editor can't keep up with my typing (type, wait, type, wait). I don't have problems with any other file types, and it does appear to get worse as the file gets longer.
Is this a known issue, and if not - what's the best way for me to submit disagnostic information so that it can be debugged by the PhpStorm team? And as a side question, are there any plans or markdown support?