Intel UHD 630 vram 7mb + slow boot & shutdown

I have followed Dortania's OpenCore Install Guide (version 0.6.1) for my hackintosh (Catalina 10.15.6). But UHD 630 ( i5 9600k) vram shows 7mb always & worka slowly. shutdown takes too long & sometimes it stuck. boot time also slow.

Here is my Configuration:

1. Motherboard: Gigabyte z390 Gaming X
2. CPU: Intel i5 9600k
3. GPU: Intel UHD 630 ( No external GPU)
4. RAM: 16GB (2X8) Corsair Vengeance 3200

here is my config.plist: https://pastebin.com/sTp5Mr46

https://preview.redd.it/5s5b3z7gmtn51.png?width=1920&format=png&auto=webp&s=38effad54c1cc0a5538f039eafddf20705c746f2