I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 51)

Section 5: Selecting the Recognition Options
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To access the Speed vs. Accuracy option:

Click the expansion arrow in the Languages group.

Move the slider to Speed for faster processing.

Or move the slider to Accuracy for better recognition
results.
Other Recognition Options (Readiris Corporate only)
Recognizing Secondary Languages inside a single document
When your documents contain text in multiple languages, it is
recommended to select a main recognition language, combined with
several Secondary languages. You may select up to 4 secondary
languages:
 Click the down arrow right of the Secondary list and check
the boxes of the required languages.
 Secondary languages that are unavailable for the selected
main language are greyed out.