Opera 11.01 keyboard delay

[Anonymosity]

Opera 11.01 for Mac has a problem with causing a huge delay in response to keypresses when typing into textboxes. In fact, the problem got so bad that I went back to using Opera 11.00, which has a small delay, but not nearly as bad. Would that be due to the application itself and the way it interacts with the operating system, or to some setting?

UserAgent: Opera/9.80 (Macintosh; Intel Mac OS X 10.4.11; U; en) Presto/2.7.62 Version/11.00