I haven't (yet) noticed any performance problems with my H2O. However, I also have a fairly small library (<300 books) compared to some others here.
In fact, epub page turning even feels a wee bit faster compared to the previous firmware I was on (4.4.something).
I also only read epub books, compared to others. Which may or may not make any difference.
Will monitor to see if there is any performance degradation.
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