To answer your question directly: unfortunately, there is no way to speed up the download process in this case.

However, based on my experience, there is usually no point in setting the quality level to 22.

Only Google Maps provides tiles beyond zoom level 20 . For most other providers, the maximum available zoom level is 19 or 20.

And if you try to download that amount of data from Google, you'll either get blocked by Google or be unpleasantly surprised by the cost.

So you can safely reduce the quality level to 20.

For example 22 quality (maximum) with a 10km radius needs 29gb to download, but getting to just 2gb is taking too long using the handler.