Your connection appears to be adequate based on the information provided.
You're asking if a speed test result of 339.6 Mbps is considered fast on your Wi-Fi connection.
For downloads, it's quick. Could you share your upload speed? Also, check the speed of downloading a single file.
Even quicker than Linus's web connection.
It's quite fast. I think it's using 5GHz Wi-Fi.
You're welcome! That's accurate.