I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 10)

Introducing Readiris
12
New iHQC Engine
The new iHQC engine used in Readiris 14 is now compatible with
the Preview application on Apple iOS and Mac OS 10.7.
Multi-thread Processing
Readiris uses Multi-thread Processing if your computer is equipped
with a multi-core processor.
Thanks to Readiris' multi-threading architecture, the processing
speed has been drastically improved.
How does Multi-thread Processing work in Readiris?
When you open or scan a document, Readiris carries out several
conversion tasks - or threads - in order to recognize the document.
The number of threads Readiris is able to execute at the same time,
depends on the number of cores in your computer. Suppose your
computer is equipped with a quad-core processor. In that case,
Readiris is able to execute 4 threads on 4 different pages. As soon
as one thread is finished on a page, Readiris immediately starts the
next one.