This could be completely normal behavior as I’m new to the Forza family of games, but the save times seem awful. It takes anywhere from 30-60s of the saving screen after completing a tune. upgrade or claiming a DLC/car pack car. I initially installed FH4 on my HDD (2tb 7200rpm) as I didn’t have enough room on my SSD. I bought a new SSD (Samsung 860 Evo 500gb) and used the move function from ‘Apps & Features’ to change to my SSD partition but the load times have not changed. It seems as if the game save could be on my smaller SSD (X25-m 160gb)
My machine is a hodge podge of old and new, but overall has played the game fairly well.
Intel i5-3330
16gb DDR3
EVGA 1060 SC - driver 417.01
2tb WD HDD
500gb 860 EVO SSD
160gb X25-M SSD
Windows 10 - 1809 Build 17763