That sounds like a very painful and not fun process, not sure why anyone would choose to boot up a Mac to add a podcast to the watch that way, the WatchPlayer app is really well designed and lets you get new episodes on the fly over LTE when you are out and about rather than needing to first find a Mac that then uploads it to your account etc.Or you can follow this link: https://watchaware.com/post/20789/hack-music-apple-watch-podcast-app. It will show you how to put podcasts on your watch. It works great!
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Haven’t had the issue you are describing, so far no issues with the radio app it works fast over LTE etc.