RaspberryPi4 Samba Transfers Unusually Slow With Large Files

I installed Samba on Raspy 4 and configured the NTFS file system hard drive connected to Raspy as a shared folder.The client PC (Ubuntu and Mac) is connected wirelessly via the router.

The problem is that when I try to view the shared folder from the client PC through File Manager, it is slow, and there is a lag until the file name/folder name.
However, it does not mean that the connection speed is slow, nor is it slow when copying and pasting large files.
Hard drive access speed is fine on the raspy, so it does not appear to be a file system issue.
Also, transferring folders containing a large number of files using scp is sufficiently fast (although of course it's faster to zip them up in advance).
It takes nearly 10 times longer to transfer the same folder than it takes to transfer using samba and scp.

Based on the above, I think it's not a communication environment or file system issue, but a Samba configuration issue, but what is the possible cause of the abnormally slow transfer of folders containing a large number of files?

Below is the OS and Samba version information.
OS:rasbian10
Samba: 4.9.5