Premiere Pro 2021 not using so much GPU to decode H.265

[Indiana0101]

20/04/2021 I have update premiere pro with latest version.

Normally, I edit 4K video with H.264 no any problem, it's very smooth! (CPU and GPU both working)

Then I film with GoPro Hero 9, high bitrate (it shows HEVC in footage's properties), no color mixing then no problem, if start doing the color correction then become very choppy. My CPU is utilizing in 100%, GPU showing 10%~20%. The preview still so choppy! 

I have check all of my settings, Mercury Playback check, Nvidia setting turn to High Performance to Premiere Pro, Nvidia CUDA driver latest, Nvidia driver latest!

My configuration:

• Adobe Premiere Pro 2021 latest
• Windows 10
• Processor: Intel Core i7-10700F
• GPU: Gigabyte GTX 1660 Super 6GB
• RAM : 32GB
• Samsung EVO 970 500GB