I've got the virus scanner from Sophos installed on my Mac with on-access-scan enabled.
The on-access-scan delays the dictionary pop-up for several seconds for every first prompt after boot up.
You can prompt the dictionary pop-up by using either ctrl+⌘+D or three fingers double-tab.
I can choose to disable on-access-scan for
/Applications/Dictionary.app in the SophosAV preferences. However, this does not solve the problem. What should I do?