This was written here and there but I wanted to add something to the probling regarding a very sluggish visual post editor.
I am using WP 3.4.1 in Firefox 13 in Windows 7 Professional 64Bit
The editor ist very slow and responses badly.
On my computer there is a parallel Installation of Windows XP SP 3 32 Bit and the Firefox I use is a portable one that is used on both Installations. When I use the editor on XP everything is fine. On Win 7 I have the above problems.
The editor works just fine in Chrome 20 under both OSes AND the editor works just fine in FF13 under Win 7 if I use a TinyMCE-Demo from the TinyMCE-page.
Insights? Ideas? Link to a thread that I might have missed?