Also, I thought a wired USB-C sync would be very fast.This took a long time. Ultimately, I just wanted to do whatever happens during a WiFi [which I am used to] Sync. That did not happen.

[a bit off-topic here] My S24+ has a USB-C connection for both power and data. So, I should be getting a very fast data transfer because the PC has one USB-C port.
EDIT: I connected my S24+ via USB-C cable to PC USB-C cable. But, I must have screwed up the settings. It seems as if all files are being synced rather than just the music files that were added/changed. As it syncs, I am checking the files/folders on the S24+. It seems all the folders there are getting dated today, but not the music files themselves?

I also had problems with the speed of the sync of flac between my wired PC and phone/tablet with MMA on Wifi. This week I found out that you can connect an Android device [b]wired[/b] to the network. I already have some years an Eminent 1017 Gigabit ethernet --> USB connector. I added a small USB --> USB C connector and my Android device worked without any problem as a wired device!
When I sync from my Win11 PC to my wired Android devices I now reach an average speed of 150 Mbps speed, as shown by the Win11 performance dashboard (large, 24/96 files).

Comcast internet, S24+, I thought the 6 year old PC would be the drag?

You have 2 bottlenecks, the speed of transfer between MMW PC and MMA device, and how fast the storage is. With upgrading wi-fi on the PC, you need to make sure that your home wi-fi can handle the faster connection, otherwise you need to upgrade it too.

Note that wired for the PC is the best.

The desktop PC is 6 years old. My S24+ phone probably has a much faster WiFi than the PC. Would it be worth it to add a thumb drive USB internet to it as a try to speed things up during a WiFi sync?

I have noticed that FLAC takes longer when doing a WiFi sync from MMA. I wanted to connect a wire [USB-C] cable and start the sync from my PC with MM5 installed. Could not figure it out. I just assumed the wired sync would be much faster.
EDIT: Oops. The USB-C cable got disconnected from the PC.