Just to make it clear: you've made such a wonderful job with your theme and optimization of your IPS suite and I don't know a way right now to further improve that without breaking update compatibility, but I see there is a lot improvements required from IPS or by an application if possible, to allow maximizing Google pagespeed score. As this totally affects the search engine ranking, I see a high need for that and I hope I'll get time in future to solve this via update-save application or theme or both.
This was a feature in IPBWI for WordPress v3 and I plan to re-develop and release that as extension for v4 this Fall or Winter.
Any update on these features? If not, any exciting new thing with IPB and WP that you're working on?