Last week i swapped my CPU from i7-5820K to an i7-6900K, which is an 8-Core Broadwell-E. On a full patched Windows 10 with all Drivers, etc. RAWs from Canon 5D3 and 5Ds.
Curios what LR utilizes from that available CPU-Power i always have a look at the TaskManager what happens for all cores.
Exporting two or more Tasks at once (always 200 Pictures) works nice, but not at really full power like we were used in the first CC-Versions. *sad*
OK, Exporting seems to use all cores. (At the top left you see what happens at it jumps three, four or five Pictures, i hope you know what i mean.)
But generating the 1:1-Previews is sooo slow. Oooone aaaafteeer *yawn* aaanother... It uses just one core and nothing else. Hmmm. Year 2016... Really?
Please Change that annoying behaviour.