Slow file upload with HTTP/2

[ZWC-father]

Slow file upload when I enable HTTP/2.

Only 2 mb/s,
When I disable http/2, it will be much faster than before (25mb/s).
It seems that many people face the same problem.
Both apache and nginx are very slow with http/2.
I have tried NC19 , NC22 and NC23, but it makes no changes at all.

Operating system: Ubuntu20.04
Web server: Nginx1.21.5 or apache 2.4.43
Database: mysql8.0
PHP version: php7.4.3 with opcache and APCu
Nextcloud version: 23.0.0
Updated from an older Nextcloud/ownCloud or fresh install: fresh install

Nginx configuration:

listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name cloud.example.com;

ssl_certificate     /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;

client_max_body_size 10240M;
client_body_timeout 3600s;
fastcgi_buffers 64 4K;

......

[solracsf]

Duplicate of nextcloud/documentation#9578