Igor have made great job improving speed of reports generation on linux, which uses the FreeType library (instead of wxWidgets+OS like on WIN/MAC). As result, time of report of one developer go down from 3 second to 0.3.
Actually FreeType library can be used on MAC and WIN. Just no big sense because it was much slower.
Now we see sense to enable TWO render-engines on MAC/WIN and be able switch them runtime. This will be useful for building of automated test-system for reports.