Sabnzbd slowdown when processing

Hi all.
I have an rclone mount set up and using mergerfs as a link between my local drive and my teamdrive for sonarr/radarr.

Sabnzbd will be happily downloading away at around 60MB/s, but it will then drop down to <2MB/s
I believe it is when the arrs are processing files in to the mergerfs mount.
I didn't notice a slowdown like this before, but before I implemented mergerfs, I was always just writing locally. (even though the mergerfs writes locally at first).

I don't know if it's a configuration issue with rclone, or mergerfs, or if I'm just being really stupid and have missed something else.

A few specs
OS: Ubuntu 18.04.5 LTS (64 bit)
CPU: Intel Xeon L3426 (8) @ 1.799GHz

I have used @Animosity022's service scripts (Thank you for publishing your scripts - I've found them really helpful)
This is my rclone mount command

ExecStart=/usr/bin/rclone mount media: /home/tunes/TD/media
--dir-cache-time 160h
--log-level INFO
--log-file /home/tunes/logs/rclone.log
--poll-interval 15s
--umask 002
--user-agent animosityapp
--rc-addr :5572
--vfs-read-chunk-size 128M
ExecStop=/bin/fusermount -uz /home/tunes/TD/media
ExecStartPost=/usr/bin/rclone rc vfs/refresh recursive=true --rc-addr _async=true

This is my mergerfs mount command

/usr/bin/mergerfs /home/tunes/local:/home/tunes/TD/media /home/tunes/media -o rw,use_ino,allow_other,func.getattr=newest,category.action=all,category.create=ff,cache.files=auto-full

The drive supplied to the server is showing as a virtual disk

Vendor: Dell
Product: Virtual Disk
Revision: 1028
Compliance: SPC-4
User Capacity: 3,999,688,294,400 bytes [3.99 TB]
Logical block size: 512 bytes
Device type: disk

It isn't just making Sabnzbd slow, for instance whilst writing this, I installed smartmontools to get the disk info and the progressed crawled along whilst trying to install it.
At this precise moment the server utilisation is 27.75%, but the IOWait is 30.9

If this is something I need to tweak in my rclone settings (or mergerfs settings), I'd appreciate peoples thoughts/suggestions.


So if you write locally without mergerfs, it works fine?

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