Dec 13th update reduced performance, loading time issues

Hello
My game used to run flawlessly until the Fortune Island update.

I have the following issues:

  • Freezing on main menu when selecting continue
  • Slower loading times and car reset times
  • Map has black background when opening before loading a lower quality version of the map background, before finally loading the full map (map slow loading)
  • Texture reloading and glitching when rewinding
  • General instability

Has anyone else had these issues after the update? Im running on HDD but the game ran fine beforehand. (are they making it less optimized so HDD no longer is viable, because i shouldn’t have to install on SSD to counter poor updates)

I have created a support ticket 8 days ago and no reply yet.

Specs:
i5 - 6500
EVGA GTX 1070 SC
16GB DDR4
Gigabyte H170-HD3 motherboard
1TB WD
2 x 120GB SSD

Here are some samples of a few of the issues I captured:

Map issue: https://drive.google.com/open?id=1D0vCxkcSQBzPfsFrPckuwW5qL4twZBT8
Freezing: https://drive.google.com/open?id=1EGFCiGkrRL-7tdGoTEnOaASytNgoUXVP

Any advice or similar experiences would be appreciated.
Thanks

If any forza support team sees this. Please look at my ticket, ive had more stability issues since last posting and 9 days of no reply isnt impressive. Thanks