I don't have any idea why this is happening, and, believe me, I am not complaining.

My customers are still stuck in the world of DVD and BluRay. Starting yesterday, May 17, the VP 13 Main Concept MPEG 2 template for widescreen DVDA stream started really using my non-overclocked i7 5960 and AMD 290's resources. Suddenly, Windows 10's performance monitor shows CPU utilizations from 60 to over 80% and even the GPU is showing heavy use - about 40% overall, with spikes into the 90's. 

I rendered a 68 minute video in 13.5 minutes. In the past I would have expected 30 minutes. Subject was a choir concert, with relatively minor motion, except when choirs are entering/leaving the stage (at which time usage hits high 90s and even 100%). Lots of detail, up to 50 faces on stage at a time. Most of the video has Color Curves applied, and WaveHammer is on all the clips (damps down the applause).

Input files are Canon MXF from XF300, 50 Mbps, 30p, 1920 x 1080, read from 7200 rpm HDD. Programs on a separate HDD, render output to SSD. (None of this has changed).

VP13 build 453. VPro Dynamic Ram preview 200, 16 rendering threads. On the template, rendering variable bit rate, maximum is 9Mbps, average 8.5, Min 4.0. GPU is on. Once again, nothing different than usual.

All that has changed was an update of Win 10 (worried about the ransomware this past weekend.)

Like I say, I am not complaining, just wondering...