How to reach optimal speeds with rsync?

I am using rsync to sync around ~2TB of data to a mechanical HDD-5400RPM. It's taking way too long. How can I improve the sync and check speeds to get as close as possible to maximum/optimal? Here is the rsync sync command I am running with the flags:

rsync -vvv \ # -v: Basic information, like the files being transferred. # -vv: More details, such as when files are being skipped. # -vvv: Even more detailed, including internal operations and potentially overwhelming.
  -z \ # Compress data during transfer
  -h \ # Human-readable
  -a \ # Archive mode
  -A \ # Preserve ACLs
  -H \ # Preserve hard links
  -S \ # Handle sparse files efficiently
  -X \ # Preserve extended attributes
  "$SRC" \
  "$DEST_DIR" \
  --log-file=$log_file \
  --progress \
  --links \
  --checksum \
  --bwlimit="192M" \
  --delete-during \
  --delete \
  --timeout="60" \
  --compress \
  --no-o \
  --no-g \
  --whole-file \
  --preallocate \
  --atimes \
  --update \
  --partial

And here is the rsync check command I am running with the flags:

rsync -vvv \ # -v: Basic information, like the files being transferred. # -vv: More details, such as when files are being skipped. # -vvv: Even more detailed, including internal operations and potentially overwhelming.
  -z \ # Compress data during transfer
  -h \ # Human-readable
  -a \ # Archive mode
  -A \ # Preserve ACLs
  -H \ # Preserve hard links
  -S \ # Handle sparse files efficiently
  -X \ # Preserve extended attributes
  "$src" \
  "$dest" \
  --log-file=$log_file
  --progress \
  --links \
  --checksum \
  --bwlimit="192M" \
  --compress
  --no-o \
  --no-g \
  --contimeout="60" \
  --ignore-errors \
  --stats \
  --max-delete=0 \
  --whole-file \
  --preallocate \
  --atimes \
  --update

Rsync version:

rsync --version
rsync  version 3.2.7  protocol version 31
Copyright (C) 1996-2022 by Andrew Tridgell, Wayne Davison, and others.
Web site: https://rsync.samba.org/ 
Capabilities:
    64-bit files, 64-bit inums, 64-bit timestamps, 64-bit long ints,
    socketpairs, symlinks, symtimes, hardlinks, hardlink-specials,
    hardlink-symlinks, IPv6, atimes, batchfiles, inplace, append, ACLs,
    xattrs, optional secluded-args, iconv, prealloc, stop-at, no crtimes
Optimizations:
    SIMD-roll, no asm-roll, openssl-crypto, no asm-MD5
Checksum list:
    xxh128 xxh3 xxh64 (xxhash) md5 md4 sha1 none
Compress list:
    zstd lz4 zlibx zlib none
Daemon auth list:
    sha512 sha256 sha1 md5 md4

rsync comes with ABSOLUTELY NO WARRANTY.  This is free software, and you
are welcome to redistribute it under certain conditions.  See the GNU
General Public Licence for details.

Ubuntu Server version:

ubuntu 24.04 (64 bit) LTS