With Cosmoteer 0.14.x loading time is shorter after the first time as it remembers some things.
The timing hasn't changed much between Abh 0.6.0 and 0.6.1 and only a few seconds difference for me with 0.5.3 RC3.7.
clean first load time 5 min 25+ s
normal load time 1 min 10+ s
mod changes load time 1 min 30+ s
For reference my computer scores at https://www.userbenchmark.com/
CPU: 38.5%
integrated graphics: 4.55%
dedicated graphics: 7.47%
So loading is purely the CPU's work. Playing on the other hand is a mix. However, memory size (and latency) is key to everything.