I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 56)

Readiris TM 14 – User Guide
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Unlike secondary languages, there are no limitations here.
Note: the tooltip of each page in the Pages panel indicates which
language applies to that page.
Speed vs. Accuracy
In Readiris you can choose whether to favor recognition speed over
accuracy and the other way around.
Tip: when you are processing low-quality images, it is recommended to set
this feature to accuracy. This yields markedly better results.
To access the Speed vs. Accuracy option:
 Click the language list > Other languages.
 Deactivate the option Favor recognition accuracy over speed
to speed up the processing.
Recognizing Secondary Languages inside a single document
(Readiris Corporate only)
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 language list.
 Select the Primary language.