Sync speed limited to 30MB/s, WebDAV/php bottleneck?

i just setup a nextcloud server (m5.xlarge) and windows client (c4.xlarge) at aws.
if you want to check the ec2 size: https://www.ec2instances.info

i used the settings from carsten rieger.
https://www.c-rieger.de/nextcloud-13-nginx-installation-guide-for-ubuntu-18-04-lts

i guess his settings are tuned.

using firefox as a client the download speed is ~90MB/s.
(I think thats the wire speed of the c4.xlarge.if have to test it with a 10GBit ec2.)

using cyberduck webdav the up-/download speed is ~20MB/s.

is there a way to speed up webdav?

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