Very slow startup in VM - 10 second delay

I have a weird problem with TCMD/TCC 28 running in a HyperV VM under Windows 10. On my main PC the apps open pretty much instantly.

When I start TCC there's around a ten second delay between the window opening and the version info being displayed.
Starting TCMD results in a ten second delay before the main window opens then another ten second delay before the TCC prompt window displays the version info.

Is this a known problem?

-- Mike