Can confirm a significant speed-up on PC with version 2.2.4 compared to 2.1.13 (
analysis 2.1.13) Minor increases in GPU utilization. Still, the performance is still pretty CPU dependent/limited. Interestingly, it seems the Log2 engine seems to be unable to create more than 85 fps overall due to CPU boundness in my system, independent what graphic card I would use... (if the GFX influence is taken out by low settings and GPU load < 100%, no difference between 400x400 and 1024 x 786).
Question, has someone else more FPS in this spot? GPU seems not to matter...
Most positively, the input lag in low FPS situations, which made timed puzzles hard to impossible, seems gone, hurray!
640x400 all low settings, no frame cap, 1 CPU core 3.6GHz, Twigroot forest: not GPU bound, CPU bound and fully utilizing 1 core(+20% FPS vs 2.1.13)
640x400 all low settings, no frame cap, 2 CPU cores 3.6GHz, Twigroot forest: not GPU bound, CPU bound and NOT fully utilizing 2 cores(!)(+20% FPS vs 2.1.13)
640x400 all high settings, no frame cap, 2 CPU cores 3.6GHz, Twigroot forest: just GPU bound, (almost)CPU bound and NOT fully utilizing 2 cores 
Near sweet spot between balanced CPU and GPU load ( if both 100% used)? both seems good utilized....
640x400 all high settings, no frame cap, 1 CPU core 3.6GHz, Twigroot forest: not GPU bound, CPU bound and fully utilizing 1 core
1024x786 all high settings, no frame cap, 2 CPU cores 3.6GHz, Twigroot forest: GPU bound, not CPU bound
1024x786 all low settings, no frame cap, 2 CPU cores 3.6GHz, Twigroot forest: not GPU bound, CPU bound and NOT fully utilizing 2 core
400x400 all low settings, no frame cap, 2 CPU cores 3.6GHz, Twigroot forest: not GPU bound, CPU bound and NOT fully utilizing 2 core 