NC Client slow sync pace 1 file per 30s in E2E folder

Hi Nextcloud Help

My Nextcloud Client 3.2.4 with E2EE enabled syncs about one E2E file every 30 seconds. Is this normal or can you speed it up? Files are small, no heavy stuff at all, just a very slow pace.

Files of non-encypted folders sync very fast.

Thanks for your support!