1) Figures for 1617 are historically correct and correspond globally to the date indicated in the land tech original file. The problem is with normal settings all AI nations are too much slow and lag behind definitly. The same problem for IGC
2 ) Real EU has for effect to give all nations, major and minor, tthe chance to get the right level roughly at the normal date ( given of course delays for muslims and other). By example, all minor nations which reach new tech level faster than major, even when in latin group, are now on exotic, without any side effect.
3)In normal settings and IGC, major nations are the slowest with many side effects, as ssmall nations get tech advance.
Conclusion: Real EU doesn't slow the research: it speeds it up, as much for major than minor. Once again, figures for 1617 have to be compared with the second column in the original research files ( land, naval, infra, and trade): cureently my mod is the only one giving assurance of a normal tech development in a GC