On 10/18/2017 06:30 PM, Dominik Inführ wrote: > In Step 1 the non-prefetch-path does use obj->size() while walking but the prefetch-path doesn't. No it does not, the obj->size() there is superfluous line that I forgot to remove :D Step 1 is about walking under TAMS with a bitmap, no size iteration at all. -Aleksey