Need help from the smart guys again

What the hell is going on?
Internal windows wireless network.
I used to be able to transfer files from one computer to the other in a flash.
Now when one computer see the other and I click on the C drive it takes a long time to display the folders on the drive.
Once a folder is chosen it takes forever to open that and so on. Then to transfer the file itself takes another eternity.
I could send them by USPS faster.
I assume there's a simple fix?
I have not tried anything other than cursing the world at large.

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