Odd. I run pretty high bitrate 4k streams and don’t stutter as this has been my current config:
/usr/bin/rclone mount gcrypt: /gmedia --allow-other --dir-cache-time 48h --vfs-cache-max-age 48h --vfs-read-chunk-size 32M --vfs-read-chunk-size-limit 1G --buffer-size 16M --syslog --umask 002 --rc --log-level INFO
What’s your full mount command you are using?