Rclone v1.70.1 nfsmount is extremely slow

What is the problem you are having with rclone?

I'm using rclone nfsmount on mac to stream media files from an sftp mount. After upgrading to v1.70.1, the mount is extremely slow.

The read speeds are reduced from 42.75MB/s to 334.20kB/s.

Run the command 'rclone version' and share the full output of the command.

rclone v1.70.1
- os/version: darwin 15.5 (64 bit)
- os/kernel: 24.5.0 (arm64)
- os/type: darwin
- os/arch: arm64 (ARMv8 compatible)
- go/version: go1.24.4
- go/linking: dynamic
- go/tags: cmount

Which cloud storage system are you using? (eg Google Drive)

SFTP

The command you were trying to run (eg rclone copy /tmp remote:tmp)

v1.70.1 (334.20kB/s)

~/Downloads/rclone/rclone-v1.70.1-osx-arm64 % ./rclone nfsmount rx: ~/.mount/rx \
  --vfs-cache-mode full \
  --vfs-fast-fingerprint \
  --poll-interval 0 \
  -v
% rsync ~/.mount/rx/tmp/Zodiac.mkv .
sending incremental file list
Zodiac.mkv
     37,781,504   1%  334.20kB/s    2:25:35

v1.69.3 (42.75MB/s )

~/Downloads/rclone/rclone-v1.69.3-osx-arm64 % ./rclone nfsmount rx: ~/.mount/rx \
  --vfs-cache-mode full \
  --vfs-fast-fingerprint \
  --poll-interval 0 \
  -v
% rsync ~/.mount/rx/tmp/Zodiac.mkv .
sending incremental file list
Zodiac.mkv
    137,396,224   4%   42.75MB/s    0:01:04

The rclone config contents with secrets removed.

[rx]
type = sftp
host = XXX
key_file = ~/.ssh/id_rsa
md5sum_command = md5sum
sha1sum_command = sha1sum
shell_type = unix

welcome to the forum,

upgrading from what version?
if you downgrade, does the speed increase?


post a debug log

Yes, I have tested with v1.69.3 & v1.70.1.

As a new user, the forum won't let me add any attachments, here is the log https://divd.net/debug.txt