Copy text (Ctrl + C) in Editor is really slow, takes about 5 seconds, and Toad is unusable. (4307730)

Ctrl + C any word in the Editor takes long time - about 5 seconds. Toad is unusable, hangs, or frozen during that time. This issue started after upgrading to Toad 12.8.

Go to the View menu | Toad Options | Editor | Behavior | uncheck the “Copy text in rich text format” option | and then restart Toad.  

In 12.9 and above, the above option is unchecked, by default. If the option is unchecked and you still experience the issue, while connected to a schema with a large amount of objects, e.g. Oracle Financials (APPS):

WORKAROUND

Go to View | Toad Options | Editor | Display | Object Name Highlighting - uncheck Table Names, View Names and Stored procedure names

STATUS

Waiting for fix in a future release of Toad for Oracle