Years ago at a former company, my Mac end users experienced slow performance accessing their Windows file servers. They learned on their own to simply copy the files locally to work and copy them back when done.
We later discovered the issue was not with the computers and not with the server. It was a network switch in their vicinity. It got replaced with a newer model and suddenly they could work off the server as they preferred.
Our Windows end users never really noticed a problem because they weren't working with graphics files.
A simple test you can perform is to stand up a temporary test Windows server locally to your Macs and compare speeds over a local network segment with speeds to your primary servers. Your network and server teams may be able to monitor where performance is impacted.
Also, confirm you're actually working from Windows file servers not some network appliance running its own flavor of SMB. And confirm your end users aren't storing thousands of files in a single directory, which can make browsing sluggish.
