Seadrive 2.0 Linux very slow writes into SeaDrive folder

I’m getting very slow writes (~ 25-33 MB/s) to the local SeaDrive folder mounted in /home/user. Outside the mount I get the expected copy speeds for an SSD (>100 MB/s). I tried remounting the folder with:
seadrive -o big_writes -d /home/arch/.seadrive /home/arch/SeaDrive
But there wasn’t much change.

On Windows, I get normal speeds with that Seadrive client.

Is there something I can do to increase local throughput on FUSE mount?

Anyone have any ideas? Am I barking up the wrong tree here?