Comment by Allybag

Seems like the 90% faster case is opening the same exact file every single time, which seems like a not super standard use case that will benefit the most from this caching. On an example where you never open the same file twice this will presumably be slightly slower than before, as you’re doing the same thing but writing to a cache. So you can make the headline “Drop performance cost by 90%!” or “Modestly increase performance cost” and be correct but I don’t think either is really a reasonable description of the change.