Hi Frank,
Experimenting with autoptimize settings. Optimizing CSS and JS works well. Optimizing HTML (with "Keep HTML comments?" checked because we run Adsense) improves google page speed insights score but causes the CPU% on our servers (2 EC2 instances on AWS) to spike to 100%. We use WP-FFPC cache with PHP Memcache. Any idea why this might be? Website is:
HTML optimization is currently disabled.