'FFmpeg Cropping Fps Drop

FFmpeg Commands works but having a problem in fps drop also using libx264 for encoding any idea to get this good

"-y" "-noautorotate" "-ss" "301" "-t" "11" "-i" "/mnt/shared/Pictures/[BTCLOD.COM] COSTA RICA IN 4K 60fps HDR (ULTRA HD)-1080p60.mp4" \
"-strict" "experimental" "-vf" "crop=w=606:h=1080:x=657:y=0" \
"-vcodec" "libx264" "-crf" "18" "-r" "15" "-b:v" "2500k" \
"-acodec" "copy" "-ab" "128k" "-sample_fmt" "s16" \
"-ss" "0" "-t" "11" "/storage/emulated/0/VEditor/VideoCroper/[BTCLOD.COM] COSTA RICA IN 4K 60fps HDR (ULTRA HD)-1080p60-0-6.mp4"


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