Yep. I noticed it during the beta too but it seems to be even worse now.
I got 32GB of DDR4 RAM. I use MSI Afterburners/RTSS to monitor my performance. It starts around 9GB when the game launches and it climbed up to 20GB this evening just after doing a few missions. The performance degradation is there too. I have done the same mission/map multiple times and the performance gets worse with each new run.
Win 10
i7 7700K @ 4.7GHz
RTX 2070 (526.98)
32GB DDR4 RAM
EVO 860 SSD (Game’s on it)