I don't think it's only a matter of speed. Of course it's only anecdotal evidence, but when I was studying at university I could register pretty much everythin

I don't think it's only a matter of speed. Of course it's only anecdotal evidence, but when I was studying at university I could register pretty much everything by hand (thanks to using a fountain pen. Those who wish to write fast for any reason should consider a fountain pen - with a medium or broad, relatively stiff nib) and still I find manual note taking much more effective than typing. You still are doing lots of mental computations when you write by hand, even if you don't need to summarize.