The app uses the same exactly CDN as the website, same URLs to download files. Are you sure you don’t have any software on your computer that might be limiting the available bandwidth for the app?
No there is no program Limiting the download speed. I assume it's how the app handles downloads.
an update on the download, after a restart and a reinstall of the app, games stated to actually complete the download (rather than be stuck while simultaneously saying its downloading) however the speeds are still slow, taking longer than 30 min to download a relatively small game