if "original PW" means 1st gen, the current ones are faster, and as fast as the equivalent Kobos
but any e-ink will seem slow if you are used to tablet response times
there was a CPU speed increase at 2nd generation, and later models also have more ppi, more fonts...
https://en.wikipedia.org/wiki/Amazon...ond_generation)
before spending any money, consider a factory reset of the current one, in case it has slowed due to software behaviour.
and see here
https://blog.the-ebook-reader.com/20...parison-video/
"..Overall speed is about the same between the two. Page turns are the same speed and sometimes the Kobo is a bit faster to open a menu or the dictionary, and sometimes the Kindle is faster. There’s no real advantage either way."