I don't even have time to see the 'Searching dictionary for...' toast on my Forma, so, err, I don't know?

.
Even on the H2O, with its terrible storage performance, it's pretty decent.
I imagine it could possibly be a weird performance issue with the way the userstore is implemented on Kindle... but I'm also not seeing anything wrong on my PW2, which sits neatly between the H2O and the Forma in terms of performance, as expected (although, mostly closer to the H2O, which, again, makes sense, given the age).