SophosAV slows the dictionary pop-up 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+&#x2318;+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?
I'm stupid. Of course one has to exclude the location where the actual dictionaries are located.

In the Sophos preferences you need to exclude the following locations from your on-access-scan:

 1. /Library/Dictionaries

 2. /Users/your_username/Library/Dictionaries