[qa] PDF generation acceleration

PDF can get quite long to generate when they include many pages, which happens often with line sheets and B2B orders. We have been working on PDF processing optimisation and are happy to announce a drastic cut of 50% on the generation time. As an example, generation time of a line sheet with 500 products x 3 variants (eg. 1,500 references) went down from 40 seconds to 17 seconds.

This will benefit to users generating PDF from the web apps (back-office and showroom) and to iPad users as well (as order sheets PDF are generated by the web platform on-the-fly).