[JKyle]

■ System Environment

StaxRip : 2.1.0.2
Windows : Windows 10 Home 2004
CPU : Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz

■ Source video

LG: New York HDR

■ Remuxing of the original ts to mkv

ffmpeg -hide_banner -analyzeduration 100M -probesize 50M -i "LG New York HDR UHD 4K Demo.ts" -map 0 -c copy -bsf:a aac_adtstoasc -y "LG New York HDR UHD 4K Demo.mkv"

■ Resize

Spline64Resize (avs): 4K to FHD

■ Video encoding command line (avs2pipe, x265)

D:\Utilities\StaxRip\Apps\Support\avs2pipemod\avs2pipemod64.exe -y4mp "D:\Work\tmp\LG New York HDR UHD 4K Demo_temp\LG New York HDR UHD 4K Demo.avs" | D:\Utilities\StaxRip\Apps\Encoders\x265\x265.exe --crf 27 --output-depth 10 --aq-mode 3 --qg-size 8 --aq-strength 2 --me star --bframes 3 --rc-lookahead 30 --ref 5 --master-display "G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(12000000,500)" --colorprim bt2020 --colormatrix bt2020nc --transfer smpte2084 --repeat-headers --hrd --aud --psy-rd 3 --frames 1806 --y4m --output "D:\Work\tmp\LG New York HDR UHD 4K Demo_temp\LG New York HDR UHD 4K Demo_out.hevc" -

■ Result (from slowest to fastest)

x265M-3.3+10-g08d895bb6-gcc9.3.0
7.61 fps (237.29s)

x265M-3.3+10-g08d895bb6-msvc-vs2019
7.77 fps (232.41s)

x265M-3.3+10-g08d895bb6-gcc10.0.1
7.97 fps (226.74s)

x265-3.3+10-g08d895bb6-gcc10.0.1
8.02 fps (225.10s)